docker-publish..yml

name: Publish Docker Image to GHCR

on:
  workflow_dispatch:
  push:
    branches: main
  pull_request:
  release:
    types:
      - created
    
env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-n-publish:

    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write
    strategy:
      matrix:
        platform:
          - linux/amd64
          - linux/arm64

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}   
          tags: |
            type=schedule
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index            

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v3

      # login to ghcr only when tagged with "v*"
      - name: Login to image registry ${{ env.REGISTRY }}
        if: startsWith(github.ref, 'refs/tags/v')
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      # Build and push Docker image with Buildx (don't push on PR)
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v5
        with:
          context: .
          platforms: ${{ matrix.platform }}
          #push: ${{ startsWith(github.ref, 'refs/tags/v') }}
          push: false
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}
          provenance: mode=max
          sbom: true
          outputs: |
            type=image,name=target,annotation-index.org.opencontainers.image.title=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.title'] }},annotation-index.org.opencontainers.image.description=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.description'] }},annotation-index.org.opencontainers.image.licenses=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.licenses'] }},annotation-index.org.opencontainers.image.documentation=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.documentation'] }},annotation-index.org.opencontainers.image.source=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.source'] }},annotation-index.org.opencontainers.image.url=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.url'] }}
          # BuildKit doesn't preserve cache mounts in the GitHub Actions cache by default
          # see: https://docs.docker.com/build/ci/github-actions/cache/#cache-mounts
          # cache-from: type=gha
          # cache-to: type=gha,mode=max

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: startsWith(github.ref, 'refs/tags/v')
        uses: sigstore/cosign-installer@v3.4.0

      - name: Sign the images with GitHub OIDC Token
        if: startsWith(github.ref, 'refs/tags/v')
        env:
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
          TAGS: ${{ steps.meta.outputs.tags }}
        run: |
          images=""
          for tag in ${TAGS}; do
            images+="${tag}@${DIGEST} "
          done
          cosign sign --yes ${images}