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= -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"]