Automatically build and publish container images to Github Container Repo

.github/workflows/container.yml

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+name: "Container image build"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+
+jobs:
+
+  image:
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value={{date 'YYYY-MM-DDTHH-mm'}}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.ref == 'refs/heads/master' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM docker.io/golang:bookworm AS builder
+
+WORKDIR src
+
+COPY *.go ./
+COPY processors/ ./processors/
+
+RUN go mod init gtfstidy
+RUN go mod tidy
+RUN go build .
+
+FROM docker.io/debian:stable-slim
+
+COPY --from=builder /go/src/gtfstidy /usr/local/bin/gtfstidy
+
+ENTRYPOINT ["/usr/local/bin/gtfstidy"]