diff --git a/.github/workflows/build-ruby.yml b/.github/workflows/build-ruby.yml
new file mode 100644
index 0000000..000ab3f
--- /dev/null
+++ b/.github/workflows/build-ruby.yml
@@ -0,0 +1,119 @@
+name: Build Ruby
+
+on:
+  workflow_dispatch:
+    inputs:
+      push:
+        description: Push images
+        required: true
+        type: boolean
+        default: true
+  push:
+    branches:
+      - "**"
+
+env:
+  REGISTRY: ghcr.io
+  REPO: datadog/images-rb
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - engine: ruby
+            version: "2.1"
+          - engine: ruby
+            version: "2.2"
+          - engine: ruby
+            version: "2.3"
+          - engine: ruby
+            version: "2.4"
+          - engine: ruby
+            version: "2.5"
+          - engine: ruby
+            version: "2.6"
+          - engine: ruby
+            version: "2.7"
+          - engine: ruby
+            version: "3.0"
+          - engine: ruby
+            version: "3.1"
+          - engine: ruby
+            version: "3.2"
+          - engine: ruby
+            version: "3.3"
+          - engine: ruby
+            version: "3.4"
+          - engine: jruby
+            version: "9.2"
+          - engine: jruby
+            version: "9.3"
+          - engine: jruby
+            version: "9.4"
+    runs-on: ubuntu-latest
+    name: Build (${{ matrix.engine }} ${{ matrix.version }})
+    steps:
+      - name: Set variables
+        id: vars
+        run: |
+          echo "SRC=engines/${{ matrix.engine }}/${{ matrix.version }}" >> $GITHUB_OUTPUT
+          echo "IMAGE=${{ env.REGISTRY }}/${{ env.REPO }}/engines/${{ matrix.engine }}" >> $GITHUB_OUTPUT
+          echo "TAG=${{ matrix.version }}" >> $GITHUB_OUTPUT
+          echo "DOCKERFILE=engines/${{ matrix.engine }}/${{ matrix.version }}/Dockerfile" >> $GITHUB_OUTPUT
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Using docker-container engine enables advanced buildx features
+      - name: Set up Docker container engine
+        run: |
+          docker buildx create --name=container --driver=docker-container --use --bootstrap
+
+      # First, build image for x86_64 as it will fail fast
+      #
+      # Tagging is necessary to reference the image for the testing step
+      # Tagging is done separately to avoid interfrence with caching
+      - name: Build single-arch image (x86_64)
+        run: |
+          docker buildx build ${{ steps.vars.outputs.SRC }} --builder=container --cache-from=type=registry,ref=${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} --output=type=image,push=false --platform linux/x86_64 -f ${{ steps.vars.outputs.DOCKERFILE }}
+      - name: Tag single-arch image (x86_64)
+        run: |
+          docker buildx build ${{ steps.vars.outputs.SRC }} --builder=container --cache-from=type=registry,ref=${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} --load --platform linux/x86_64 -f ${{ steps.vars.outputs.DOCKERFILE }} --tag ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }}
+      - name: Test single-arch image (x86_64)
+        run: |
+          docker run --platform linux/x86_64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} ruby -e 'puts RUBY_DESCRIPTION'
+          docker run --platform linux/x86_64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} gem --version
+          docker run --platform linux/x86_64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} bundle --version
+
+      # Then, build image for aarch64 which, being emulated under qemu, is slower
+      #
+      # Tagging is necessary to reference the image for the testing step
+      # Tagging is done separately to avoid interfrence with caching
+      # Start by enabling qemu for aarch64
+      - name: Enable aarch64 emulation (x86_64)
+        run: |
+          docker run --privileged --rm tonistiigi/binfmt --install arm64
+      - name: Build single-arch image (aarch64)
+        run: |
+          docker buildx build ${{ steps.vars.outputs.SRC }} --builder=container --cache-from=type=registry,ref=${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} --output=type=image,push=false --platform linux/aarch64 -f ${{ steps.vars.outputs.DOCKERFILE }}
+      - name: Tag single-arch image (aarch64)
+        run: |
+          docker buildx build ${{ steps.vars.outputs.SRC }}  --builder=container --cache-from=type=registry,ref=${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} --load --platform linux/aarch64 -f ${{ steps.vars.outputs.DOCKERFILE }} --tag ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }}
+      - name: Test single-arch image (aarch64)
+        run: |
+          docker run --platform linux/aarch64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} ruby -e 'puts RUBY_DESCRIPTION'
+          docker run --platform linux/aarch64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} gem --version
+          docker run --platform linux/aarch64 --rm ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} bundle --version
+
+      # Finally, assemble multi-arch image for a combined push to the registry
+      #
+      # This reruns docker build but layers are in the cache, so it's fast
+      - name: Log in to the Container Registry
+        if: ${{ inputs.push }}
+        run: |
+          echo ${{ secrets.GITHUB_TOKEN }} | docker login ${{ env.REGISTRY }} -u ${{ github.actor }} --password-stdin
+      - name: Build multi-arch image (x86_64, aarch64)
+        if: ${{ inputs.push }}
+        run: |
+          docker buildx build ${{ steps.vars.outputs.SRC }} --builder=container --cache-from=type=registry,ref=${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }} --output=type=image,push=true --build-arg BUILDKIT_INLINE_CACHE=1 --platform linux/x86_64,linux/aarch64 -f ${{ steps.vars.outputs.DOCKERFILE }} --tag ${{ steps.vars.outputs.IMAGE }}:${{ steps.vars.outputs.TAG }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..37b52cc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/.envrc
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..5f8fd63
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,6 @@
+## License
+
+This work is dual-licensed under Apache 2.0 or BSD3.
+You may select, at your option, one of the above-listed licenses.
+
+`SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause`
diff --git a/LICENSE.Apache b/LICENSE.Apache
new file mode 100644
index 0000000..929dd73
--- /dev/null
+++ b/LICENSE.Apache
@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
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+      "Licensor" shall mean the copyright owner or entity authorized by
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+      "Legal Entity" shall mean the union of the acting entity and all
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+      outstanding shares, or (iii) beneficial ownership of such entity.
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Work" shall mean the work of authorship, whether in Source or
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+      "Derivative Works" shall mean any work, whether in Source or Object
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
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+   2. Grant of Copyright License. Subject to the terms and conditions of
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+      (b) You must cause any modified files to carry prominent notices
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+      (c) You must retain, in the Source form of any Derivative Works
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+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
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+      You may add Your own copyright statement to Your modifications and
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+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      Work (including but not limited to damages for loss of goodwill,
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+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
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+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
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+      file or class name and description of purpose be included on the
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+   Copyright (c) 2024, Datadog <info@datadoghq.com>
+   All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/LICENSE.BSD3 b/LICENSE.BSD3
new file mode 100644
index 0000000..c5981dd
--- /dev/null
+++ b/LICENSE.BSD3
@@ -0,0 +1,24 @@
+Copyright (c) 2024, Datadog <info@datadoghq.com>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of copyright holders nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..126faa6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,37 @@
+# Container images for Ruby
+
+Instead of cherry-picking images across a variety of sources and bespoke-building images from these sources and yet others, this repository and corresponding packages serves as a central place to look for, provide, define, reuse, manage, an d build a set of images.
+
+The build process is envisioned as being efficient at layering for fast building, cacheability, and (a form of) reproducibility and auditability.
+
+All images should support `aarch64` and `x86_64`. When possible and relevant, there should be `glibc`- and `musl`-based variants.
+
+Use cases include:
+
+- having a consistent set of images to build other images from
+- providing base images for CI usage and testing as well as local development
+- providing minimal app images using various frameworks for CI testing (integration, system tests), issue reproduction, support engineers, pentesters...
+- making CI runtime environment reproducinble locally
+- hastening image building and fetching by mutualising commonality
+- customising in subsequent layers for bespoke usage
+
+## Images
+
+### Ruby engines
+
+Supported engines include:
+
+- `ruby`: MRI a.k.a CRuby.
+- `jruby`: These are based on Eclise Temurin JDK builds.
+- `truffleruby`: Due to the nature and state of TruffleRuby these are experimental and may or may not work as expected.
+
+### Apps
+
+#### minimal-rack
+
+These images provide a set of minimal rack-based applications covering a range of frameworks and versions:
+
+- `rack` 1.3 to 3 and up
+- `rails` 3.2 to 7 and up
+- `sinatra` 1.0 to 4 and up
+- `grape` 1.2 to 4 and up
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..02307aa
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,22 @@
+{
+  pkgs ? import <nixpkgs> {},
+  pinned ? import(fetchTarball("https://github.com/NixOS/nixpkgs/archive/47b604b07d1e.tar.gz")) {},
+}:
+let
+  ruby = pinned.ruby_3_3;
+  llvm = pinned.llvmPackages_16;
+in llvm.stdenv.mkDerivation {
+  name = "shell";
+
+  buildInputs = [
+    ruby
+    pinned.libyaml.dev
+  ];
+
+  shellHook = ''
+    export RUBY_VERSION="$(ruby -e 'puts RUBY_VERSION.gsub(/\d+$/, "0")')"
+    export GEM_HOME="$(pwd)/vendor/bundle/ruby/$RUBY_VERSION"
+    export BUNDLE_PATH="$(pwd)/vendor/bundle"
+    export PATH="$GEM_HOME/bin:$PATH"
+  '';
+}
diff --git a/src/engines/jruby/9.2/Dockerfile b/src/engines/jruby/9.2/Dockerfile
new file mode 100644
index 0000000..e539d6c
--- /dev/null
+++ b/src/engines/jruby/9.2/Dockerfile
@@ -0,0 +1,108 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM eclipse-temurin:8-jammy AS jruby-9.2.21.0-jre8
+
+RUN apt-get update && apt-get install -y libc6-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+ENV JRUBY_VERSION 9.2.21.0
+ENV JRUBY_SHA256 dbf05fca4f61bd7d5131d9b83c5f4d1a249213c474b82def37e82013969c8b8a
+RUN mkdir /opt/jruby \
+  && curl -fSL https://repo1.maven.org/maven2/org/jruby/jruby-dist/${JRUBY_VERSION}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz -o /tmp/jruby.tar.gz \
+  && echo "$JRUBY_SHA256 /tmp/jruby.tar.gz" | sha256sum -c - \
+  && tar -zx --strip-components=1 -f /tmp/jruby.tar.gz -C /opt/jruby \
+  && rm /tmp/jruby.tar.gz \
+  && update-alternatives --install /usr/local/bin/ruby ruby /opt/jruby/bin/jruby 1
+ENV PATH /opt/jruby/bin:$PATH
+
+# skip installing gem documentation
+RUN mkdir -p /opt/jruby/etc \
+  && { \
+    echo 'install: --no-document'; \
+    echo 'update: --no-document'; \
+  } >> /opt/jruby/etc/gemrc
+
+RUN gem install rake net-telnet xmlrpc
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_SILENCE_ROOT_WARNING=1 \
+    BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]
+
+FROM jruby-9.2.21.0-jre8
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq \
+            build-essential \
+            shared-mime-info; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+# Ensure JRuby is available when running "bash --login"
+RUN echo "export PATH=/opt/jruby/bin:$BUNDLE_BIN:\$PATH" >> ~/.profile
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/jruby/9.3/Dockerfile b/src/engines/jruby/9.3/Dockerfile
new file mode 100644
index 0000000..d598823
--- /dev/null
+++ b/src/engines/jruby/9.3/Dockerfile
@@ -0,0 +1,108 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM eclipse-temurin:11-jammy AS jruby-9.3.9.0-jre11
+
+RUN apt-get update && apt-get install -y libc6-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+ENV JRUBY_VERSION 9.3.9.0
+ENV JRUBY_SHA256 251e6dd8d1d2f82922c8c778d7857e1bef82fe5ca2cf77bc09356421d0b05ab8
+RUN mkdir /opt/jruby \
+  && curl -fSL https://repo1.maven.org/maven2/org/jruby/jruby-dist/${JRUBY_VERSION}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz -o /tmp/jruby.tar.gz \
+  && echo "$JRUBY_SHA256 /tmp/jruby.tar.gz" | sha256sum -c - \
+  && tar -zx --strip-components=1 -f /tmp/jruby.tar.gz -C /opt/jruby \
+  && rm /tmp/jruby.tar.gz \
+  && update-alternatives --install /usr/local/bin/ruby ruby /opt/jruby/bin/jruby 1
+ENV PATH /opt/jruby/bin:$PATH
+
+# skip installing gem documentation
+RUN mkdir -p /opt/jruby/etc \
+  && { \
+    echo 'install: --no-document'; \
+    echo 'update: --no-document'; \
+  } >> /opt/jruby/etc/gemrc
+
+RUN gem install rake net-telnet xmlrpc
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_SILENCE_ROOT_WARNING=1 \
+    BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]
+
+FROM jruby-9.3.9.0-jre11
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq \
+            build-essential \
+            shared-mime-info; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+# Ensure JRuby is available when running "bash --login"
+RUN echo "export PATH=/opt/jruby/bin:$BUNDLE_BIN:\$PATH" >> ~/.profile
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/jruby/9.4/Dockerfile b/src/engines/jruby/9.4/Dockerfile
new file mode 100644
index 0000000..b57bff5
--- /dev/null
+++ b/src/engines/jruby/9.4/Dockerfile
@@ -0,0 +1,108 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM eclipse-temurin:11-jammy AS jruby-9.4.7.0-jre11
+
+RUN apt-get update && apt-get install -y libc6-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+ENV JRUBY_VERSION 9.4.7.0
+ENV JRUBY_SHA256 f1c39f8257505300a528ff83fe4721fbe61a855abb25e3d27d52d43ac97a4d80
+RUN mkdir /opt/jruby \
+  && curl -fSL https://repo1.maven.org/maven2/org/jruby/jruby-dist/${JRUBY_VERSION}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz -o /tmp/jruby.tar.gz \
+  && echo "$JRUBY_SHA256 /tmp/jruby.tar.gz" | sha256sum -c - \
+  && tar -zx --strip-components=1 -f /tmp/jruby.tar.gz -C /opt/jruby \
+  && rm /tmp/jruby.tar.gz \
+  && update-alternatives --install /usr/local/bin/ruby ruby /opt/jruby/bin/jruby 1
+ENV PATH /opt/jruby/bin:$PATH
+
+# skip installing gem documentation
+RUN mkdir -p /opt/jruby/etc \
+  && { \
+    echo 'install: --no-document'; \
+    echo 'update: --no-document'; \
+  } >> /opt/jruby/etc/gemrc
+
+RUN gem install rake net-telnet xmlrpc
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_SILENCE_ROOT_WARNING=1 \
+    BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]
+
+FROM jruby-9.4.7.0-jre11
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq \
+            build-essential \
+            shared-mime-info; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+# Ensure JRuby is available when running "bash --login"
+RUN echo "export PATH=/opt/jruby/bin:$BUNDLE_BIN:\$PATH" >> ~/.profile
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.1/Dockerfile b/src/engines/ruby/2.1/Dockerfile
new file mode 100644
index 0000000..ef89a6b
--- /dev/null
+++ b/src/engines/ruby/2.1/Dockerfile
@@ -0,0 +1,156 @@
+# ruby:2.1.10 was based on jessie, but never got a aarch64 image
+# aarch64 used to be supported upon release but is not part of LTS, so archive.debian.org does not contain aarch64: https://www.debian.org/releases/jessie/
+
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+# Here be dragons: Last time we tried to move away from Debian stretch, we ran into issues with two gems that are used in some
+# of our CI tests/test apps.
+# If you're going to try your luck, make sure that the following work after your changes:
+# gem install mysql
+#
+# taken from https://github.com/docker-library/ruby/blob/c5693b25aa865489fee130e572a3f11bccebd21b/2.1/Dockerfile
+FROM buildpack-deps:stretch AS ruby-2.1.10-stretch
+
+# skip installing gem documentation
+RUN mkdir -p /usr/local/etc \
+  && { \
+    echo 'install: --no-document'; \
+    echo 'update: --no-document'; \
+  } >> /usr/local/etc/gemrc
+
+ENV RUBY_MAJOR 2.1
+ENV RUBY_VERSION 2.1.10
+ENV RUBY_DOWNLOAD_SHA256 5be9f8d5d29d252cd7f969ab7550e31bbb001feb4a83532301c0dd3b5006e148
+ENV RUBYGEMS_VERSION 2.7.11
+ENV BUNDLER_VERSION 1.17.3
+
+# Pull packages from debian archive, old repos don't work any more
+RUN echo "deb [trusted=yes] http://archive.debian.org/debian/ stretch main contrib non-free" | tee /etc/apt/sources.list
+
+RUN set -ex \
+  && apt-get update \
+  # ruby 2.1 needs libssl1.0-dev
+  && apt-get install -y --no-install-recommends wget \
+  && apt-get remove -y libssl-dev libcurl4-openssl-dev \
+  && ARCH=$(dpkg --print-architecture) \
+  && wget "https://snapshot.debian.org/archive/debian-security/20220317T093342Z/pool/updates/main/o/openssl1.0/libssl1.0.2_1.0.2u-1~deb9u7_${ARCH}.deb" \
+  && dpkg -i libssl1.0.2*.deb \
+  && rm -rf libssl1.0.2*.deb \
+  && wget "https://snapshot.debian.org/archive/debian-security/20220317T093342Z/pool/updates/main/o/openssl1.0/libssl1.0-dev_1.0.2u-1~deb9u7_${ARCH}.deb" \
+  && dpkg -i libssl1.0-dev*.deb \
+  && rm -rf libssl1.0-dev*.deb \
+# some of ruby's build scripts are written in ruby
+#   we purge system ruby later to make sure our final image uses what we just built
+  && buildDeps=' \
+    bison \
+    dpkg-dev \
+    libgdbm-dev \
+    ruby \
+  ' \
+  && apt-get install -y --no-install-recommends $buildDeps \
+  && rm -rf /var/lib/apt/lists/* \
+  && wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+  && echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
+  \
+  && mkdir -p /usr/src/ruby \
+  && tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+  && rm ruby.tar.xz \
+  \
+  && cd /usr/src/ruby \
+  \
+# hack in "ENABLE_PATH_CHECK" disabling to suppress:
+#   warning: Insecure world writable dir
+  && { \
+    echo '#define ENABLE_PATH_CHECK 0'; \
+    echo; \
+    cat file.c; \
+  } > file.c.new \
+  && mv file.c.new file.c \
+  \
+  && autoconf \
+  && gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+  && ./configure \
+    --build="$gnuArch" \
+    --disable-install-doc \
+    --enable-shared \
+  && make -j "$(nproc)" \
+  && make install \
+  \
+  && apt-get purge -y --auto-remove $buildDeps \
+  && cd / \
+  && rm -r /usr/src/ruby \
+  \
+  && gem update --system "$RUBYGEMS_VERSION" \
+  && gem install bundler --version "$BUNDLER_VERSION" --force \
+  && rm -r /root/.gem/
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_SILENCE_ROOT_WARNING=1 \
+    BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]
+
+FROM ruby-2.1.10-stretch
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install --force-yes --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq iptables; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose (1.8.0, fairly old)
+RUN echo 'deb [trusted=yes] http://archive.debian.org/debian/ stretch-backports main' > /etc/apt/sources.list.d/stretch-backports.list \
+  && apt-get update \
+  && apt-get install -y docker-compose \
+  && docker-compose version \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.2/Dockerfile b/src/engines/ruby/2.2/Dockerfile
new file mode 100644
index 0000000..3c42d32
--- /dev/null
+++ b/src/engines/ruby/2.2/Dockerfile
@@ -0,0 +1,160 @@
+# ruby:2.2.10-jessie was based on jessie, and had a aarch64 image
+# aarch64 used to be supported upon release but is not part of LTS,
+# so archive.debian.org does not contain aarch64: https://www.debian.org/releases/jessie/
+
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+# Here be dragons: Last time we tried to move away from Debian stretch, we ran into issues with two gems that are used in some
+# of our CI tests/test apps.
+# If you're going to try your luck, make sure that the following work after your changes:
+# gem install mysql
+#
+# taken from https://github.com/docker-library/ruby/blob/b5ef401d348ca9b1d9f6a5cb4b25f32bf013daca/2.2/jessie/Dockerfile
+FROM buildpack-deps:stretch AS ruby-2.2.10-stretch
+
+# skip installing gem documentation
+RUN mkdir -p /usr/local/etc \
+  && { \
+    echo 'install: --no-document'; \
+    echo 'update: --no-document'; \
+  } >> /usr/local/etc/gemrc
+
+ENV RUBY_MAJOR 2.2
+ENV RUBY_VERSION 2.2.10
+ENV RUBY_DOWNLOAD_SHA256 bf77bcb7e6666ccae8d0882ea12b05f382f963f0a9a5285a328760c06a9ab650
+ENV RUBYGEMS_VERSION 2.7.11
+ENV BUNDLER_VERSION 1.17.3
+
+# Pull packages from debian archive, old repos don't work any more
+RUN echo "deb [trusted=yes] http://archive.debian.org/debian/ stretch main contrib non-free" | tee /etc/apt/sources.list
+
+# some of ruby's build scripts are written in ruby
+#   we purge system ruby later to make sure our final image uses what we just built
+RUN set -ex \
+  && apt-get update \
+  # ruby 2.2 needs libssl1.0-dev
+  && apt-get install -y --no-install-recommends wget \
+  && apt-get remove -y libssl-dev libcurl4-openssl-dev \
+  && ARCH=$(dpkg --print-architecture) \
+  && wget "https://snapshot.debian.org/archive/debian-security/20220317T093342Z/pool/updates/main/o/openssl1.0/libssl1.0.2_1.0.2u-1~deb9u7_${ARCH}.deb" \
+  && dpkg -i libssl1.0.2*.deb \
+  && rm -rf libssl1.0.2*.deb \
+  && wget "https://snapshot.debian.org/archive/debian-security/20220317T093342Z/pool/updates/main/o/openssl1.0/libssl1.0-dev_1.0.2u-1~deb9u7_${ARCH}.deb" \
+  && dpkg -i libssl1.0-dev*.deb \
+  && rm -rf libssl1.0-dev*.deb \
+# some of ruby's build scripts are written in ruby
+#   we purge system ruby later to make sure our final image uses what we just built
+  && buildDeps=' \
+    bison \
+    dpkg-dev \
+    libgdbm-dev \
+    ruby \
+  ' \
+  && apt-get install -y --no-install-recommends $buildDeps \
+  && rm -rf /var/lib/apt/lists/* \
+  \
+  && wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+  && echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
+  \
+  && mkdir -p /usr/src/ruby \
+  && tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+  && rm ruby.tar.xz \
+  \
+  && cd /usr/src/ruby \
+  \
+# hack in "ENABLE_PATH_CHECK" disabling to suppress:
+#   warning: Insecure world writable dir
+  && { \
+    echo '#define ENABLE_PATH_CHECK 0'; \
+    echo; \
+    cat file.c; \
+  } > file.c.new \
+  && mv file.c.new file.c \
+  \
+  && autoconf \
+  && gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+  && ./configure \
+    --build="$gnuArch" \
+    --disable-install-doc \
+    --enable-shared \
+  && make -j "$(nproc)" \
+  && make install \
+  \
+  && apt-get purge -y --auto-remove $buildDeps \
+  && cd / \
+  && rm -r /usr/src/ruby \
+  \
+  && gem update --system "$RUBYGEMS_VERSION" \
+  && gem install bundler --version "$BUNDLER_VERSION" --force \
+  && rm -r /root/.gem/
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_SILENCE_ROOT_WARNING=1 \
+    BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]
+
+FROM ruby-2.2.10-stretch
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install --force-yes --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq iptables; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose (1.8.0, fairly old)
+RUN echo 'deb [trusted=yes] http://archive.debian.org/debian/ stretch-backports main' > /etc/apt/sources.list.d/stretch-backports.list \
+  && apt-get update \
+  && apt-get install -y docker-compose \
+  && docker-compose version \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.3/Dockerfile b/src/engines/ruby/2.3/Dockerfile
new file mode 100644
index 0000000..1d33594
--- /dev/null
+++ b/src/engines/ruby/2.3/Dockerfile
@@ -0,0 +1,83 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+#
+# Here be dragons: Last time we tried to move away from Debian stretch, we ran into issues with two gems that are used in some
+# of our CI tests/test apps.
+# If you're going to try your luck, make sure that the following work after your changes:
+# gem install nokogiri -v '= 1.10.10'
+# gem install mysql
+#
+# Last version: https://github.com/docker-library/ruby/blob/31f66490fdb837ddcc5896e3275f2188f2b7b6dd/2.3/stretch/Dockerfile
+FROM ruby:2.3.8-stretch
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Pull packages from debian archive, old repos don't work any more
+RUN echo "deb [trusted=yes] http://archive.debian.org/debian/ stretch main contrib non-free" | tee /etc/apt/sources.list
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install --force-yes --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq iptables; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose (1.8.0, fairly old)
+RUN echo 'deb [trusted=yes] http://archive.debian.org/debian/ stretch-backports main' > /etc/apt/sources.list.d/stretch-backports.list \
+  && apt-get update \
+  && apt-get install -y docker-compose \
+  && docker-compose version \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Install RubyGems and Bundler
+# NOTE: Rubygems 3.0.6 is the last version that seems to work fine in this image AND not drag bundler 2 along.
+# Later versions are either broken or they force the use of bundler 2, which we can't use because some of our
+# dependencies (e.g. rails 3.0.20) don't like it.
+RUN gem update --system '3.0.6'
+# Ruby 2.3 can support Bundler 2+
+# But hold back to < 2 for now, because some dependencies require it.
+RUN gem install bundler -v '1.17.3'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.4/Dockerfile b/src/engines/ruby/2.4/Dockerfile
new file mode 100644
index 0000000..68361da
--- /dev/null
+++ b/src/engines/ruby/2.4/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:2.4.10-buster
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Install RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.5/Dockerfile b/src/engines/ruby/2.5/Dockerfile
new file mode 100644
index 0000000..5f20c24
--- /dev/null
+++ b/src/engines/ruby/2.5/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:2.5.9-buster
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Install RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.6/Dockerfile b/src/engines/ruby/2.6/Dockerfile
new file mode 100644
index 0000000..b269e31
--- /dev/null
+++ b/src/engines/ruby/2.6/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:2.6.10-bullseye
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Install RubyGems
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/2.7/Dockerfile b/src/engines/ruby/2.7/Dockerfile
new file mode 100644
index 0000000..a0da1b2
--- /dev/null
+++ b/src/engines/ruby/2.7/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:2.7.8-bullseye
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler # Upgrading disabled until https://github.com/thoughtbot/appraisal/issues/162 is fixed
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/3.0/Dockerfile b/src/engines/ruby/3.0/Dockerfile
new file mode 100644
index 0000000..46b4f18
--- /dev/null
+++ b/src/engines/ruby/3.0/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:3.0.7-bullseye
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/3.1/Dockerfile b/src/engines/ruby/3.1/Dockerfile
new file mode 100644
index 0000000..03e7aaf
--- /dev/null
+++ b/src/engines/ruby/3.1/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:3.1.6-bookworm
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat-openbsd unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/3.2/Dockerfile b/src/engines/ruby/3.2/Dockerfile
new file mode 100644
index 0000000..421cb40
--- /dev/null
+++ b/src/engines/ruby/3.2/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:3.2.4-bookworm
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat-openbsd unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/3.3/Dockerfile b/src/engines/ruby/3.3/Dockerfile
new file mode 100644
index 0000000..042dd7c
--- /dev/null
+++ b/src/engines/ruby/3.3/Dockerfile
@@ -0,0 +1,68 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:3.3.2-bookworm
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat-openbsd unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+# Upgrade RubyGems and Bundler
+RUN gem update --system 3.3.26
+RUN gem install bundler -v '~> 2.3.26'
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]
diff --git a/src/engines/ruby/3.4/Dockerfile b/src/engines/ruby/3.4/Dockerfile
new file mode 100644
index 0000000..f27c7b3
--- /dev/null
+++ b/src/engines/ruby/3.4/Dockerfile
@@ -0,0 +1,65 @@
+# Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
+
+FROM ruby:3.4.0-preview1-bookworm
+
+# Make apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages
+RUN set -ex; \
+        apt-get update; \
+        mkdir -p /usr/share/man/man1; \
+        apt-get install -y --no-install-recommends \
+            git mercurial xvfb \
+            locales sudo openssh-client ca-certificates tar gzip parallel \
+            net-tools netcat-openbsd unzip zip bzip2 gnupg curl wget \
+            tzdata rsync vim less jq; \
+        rm -rf /var/lib/apt/lists/*;
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Set language
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+
+# Install Docker
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/$(arch)/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/$(arch)/${DOCKER_VERSION}" \
+  && echo DOCKER_URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# Install Docker Compose
+RUN COMPOSE_URL="https://github.com/linuxserver/docker-docker-compose/releases/download/1.29.2-ls51/docker-compose-$(dpkg --print-architecture)" \
+  && echo COMPOSE_URL: $COMPOSE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# Install Dockerize
+RUN DOCKERIZE_URL="https://github.com/powerman/dockerize/releases/download/v0.17.0/dockerize-$(uname -s | tr '[:upper:]' '[:lower:]')-$(arch | sed 's/aarch64/arm64/')" \
+  && echo DOCKERIZE_URL: $DOCKERIZE_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/local/bin/dockerize $DOCKERIZE_URL \
+  && chmod +x /usr/local/bin/dockerize \
+  && dockerize --version
+
+# Install RubyGems
+RUN mkdir -p "$GEM_HOME" && chmod -R 777 "$GEM_HOME"
+
+ENV BUNDLE_SILENCE_ROOT_WARNING 1
+
+RUN mkdir /app
+WORKDIR /app
+
+CMD ["/bin/sh"]