update for single dockerfile-only build

.github/workflows/build_and_publish.yml

@@ -0,0 +1,58 @@
+name: Build & Publish
+on:
+  push:
+    branches:
+      - "main"
+      - "dev"
+    tags:
+      - 'v*.*.*'
+  pull_request:
+    branches:
+      - 'main'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            ${{ github.repository_owner }}/envplate
+            ghcr.io/${{ github.repository_owner }}/envplate
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5 
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,21 @@
+# syntax=docker/dockerfile:1
+# Build docker-gen from scratch
+FROM golang:1.21-alpine AS ep-builder
+
+ARG VERSION=v1.0.3
+
+ADD https://github.com/kreuzwerker/envplate.git#${VERSION} /build
+
+WORKDIR /build
+
+RUN go mod download -json
+
+# Build the docker-gen executable
+RUN CGO_ENABLED=0 go build -ldflags '-X main.buildVersion=${VERSION} -extldflags "-static"' -o ep ./bin/ep.go
+
+FROM scratch
+
+# Install docker-gen from build stage
+COPY --from=ep-builder /build/ep /usr/local/bin/ep
+
+ENTRYPOINT ["/usr/local/bin/ep"]

README.md

@@ -1,77 +1,5 @@
-# Envplate
+# Envplate - amazee.io builder
 
-[![Release](https://img.shields.io/github/v/release/kreuzwerker/envplate)](https://github.com/kreuzwerker/envplate/releases)
-[![Build Status](https://github.com/kreuzwerker/envplate/workflows/build/badge.svg)](https://github.com/kreuzwerker/envplate/actions)
-[![Documentation](https://godoc.org/github.com/kreuzwerker/envplate?status.svg)](http://godoc.org/github.com/kreuzwerker/envplate) 
-[![Go Report Card](https://goreportcard.com/badge/github.com/kreuzwerker/envplate)](https://goreportcard.com/report/github.com/kreuzwerker/envplate) 
+This version of Envplate builds from the upstream releases at https://github.com/kreuzwerker/envplate to configure an up-to-date Dockerfile build for ease of reuse.
 
-Trivial templating for configuration files using environment keys. References to such keys are declared in arbitrary config files either as:
-
-1. `${key}` or
-* `${key:-default value}`
-
-Envplate (`ep`) parses arbitrary configuration files (using glob patterns) and replaces all references with values from the environment or with default values (if given). These values replace the keys *inline* (= the files will be changed).
-
-Failure to resolve the supplied glob pattern(s) to at least one file results in an error.
-
-Optionally, `ep` can:
-
-* backup (`-b` flag): create backups of the files it changes, appending a `.bak` extension to backup copies
-* dry-run (`-d` flag): output to stdout instead of replacing values inline
-* strict (`-s` flag): refuse to fallback to default values
-* verbose (`-v` flag): be verbose about it's operations
-
-`ep` can also `exec()` another command by passing
-
-* `--` after all arguments to `ep`
-* the path to the binary and it's arguments
-
-Example: `/usr/local/bin/ep -v *.conf -- /usr/sbin/nginx -c /etc/nginx.conf`
-
-This can be used to use `ep` to parse configs and execute the container process using Dockers `CMD`
-
-## Escaping
-
-In case the file you want to modify already uses the pattern envplate is searching for ( e.g. for reading environment variables ) you can escape the sequence by adding a leading backslash `\`. It's also possible to escape a leading backslash by adding an additional backslash. Basically a sequence with an even number of leading backslashes will be parsed, is the number of leading backslashes odd the sequence will be escaped.
-
-See https://github.com/kreuzwerker/envplate#full-example
-
-## Why?
-
-For apps running Docker which rely (fully or partially) on configuration files instead of being purely configured through environment variables.
-
-You can directly download envplate binaries into your Dockerfile using Github releases like this:
-
-```
-RUN wget -q https://github.com/kreuzwerker/envplate/releases/download/v1.0.2/envplate_1.0.2_$(uname -s)_$(uname -m).tar.gz -O - | tar xz && mv envplate /usr/local/bin/ep && chmod +x /usr/local/bin/ep
-
-...
-
-CMD [ "/usr/local/bin/ep", "-v", "/etc/nginx/nginx.conf", "--", "/usr/sbin/nginx", "-c", "/etc/nginx/nginx.conf" ]
-```
-
-## Full example
-
-```
-$ cat /etc/foo.conf
-Database=${FOO_DATABASE}
-DatabaseSlave=${BAR_DATABASE:-db2.example.com}
-Mode=fancy
-Escaped1=\${FOO_DATABASE}
-NotEscaped1=\\${FOO_DATABASE}
-Escaped2=\\\${BAR_DATABASE:-db2.example.com}
-NotEscaped2=\\\\${BAR_DATABASE:-db2.example.com}
-
-$ export FOO_DATABASE=db.example.com
-
-$ ep /etc/f*.conf
-
-$ cat /etc/foo.conf
-Database=db.example.com
-DatabaseSlave=db2.example.com
-Mode=fancy
-Escaped1=${FOO_DATABASE}
-NotEscaped1=\db.example.com
-Escaped2=\${BAR_DATABASE:-db2.example.com}
-NotEscaped2=\\db2.example.com
-```
+The original version is still available at https://github.com/kreuzwerker/envplate