WIP: added some basic devcontainer config and a simple Dockerfile bas…

…ed on cfe_ubuntu.

.devcontainer/Dockerfile

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+ARG UBUNTU_VERSION=20.04
+
+FROM ubuntu:${UBUNTU_VERSION} AS base
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+ENV TZ=America/Vancouver \
+    RUBY_VERSION=2.2.2 \
+    BUNDLER_VERSION=1.17.3
+
+RUN apt-get -y update &&\
+    apt-get -y upgrade &&\
+    apt-get install -y curl gpg
+
+RUN echo "deb http://security.ubuntu.com/ubuntu/ bionic-security main" >> /etc/apt/sources.list &&\
+    echo "deb http://security.ubuntu.com/ubuntu/ bionic main" >> /etc/apt/sources.list &&\
+    apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32 &&\
+    apt update &&\
+    apt install -y \
+    gawk=1:4.1.4+dfsg-1build1
+
+RUN curl -sSL https://rvm.io/mpapis.asc | gpg --import - && \
+    curl -sSL https://rvm.io/pkuczynski.asc | gpg --import - && \
+    curl -sSL https://get.rvm.io | bash -s stable && \
+    usermod -a -G rvm root
+
+RUN /bin/bash -l -c "source /etc/profile.d/rvm.sh && rvm pkg install openssl"
+RUN /bin/bash -l -c "source /etc/profile.d/rvm.sh && rvm requirements && rvm install ${RUBY_VERSION} --with-openssl-dir=/usr/local/rvm/usr && rvm --default use ${RUBY_VERSION}"

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+	"name": "CfE Ubuntu Ruby",
+
+	"build": {
+		"dockerfile": "Dockerfile"
+	}
+
+	"features": {
+		"ghcr.io/devcontainers/features/ruby:1": {
+			"version": "2.2"
+		}
+	}
+}