release-docker-github.yml

name: Publish

on:
  workflow_call:
    inputs:
      IS_PRERELEASE:
        description: "Whether this is a prerelease (affects latest tag)"
        required: false
        type: boolean
        default: false
    outputs:
      VERSION:
        description: release version
        value: ${{ jobs.publish.outputs.VERSION }}

env:
  REGISTRY: ghcr.io
  REGISTER_USERNAME: ${{ github.actor }}
  REGISTER_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
  IMAGE_NAME: ${{ github.repository }}

jobs:
  publish:
    runs-on: ubuntu-4c
    permissions:
        contents: read
        packages: write
        id-token: write

    outputs:
      VERSION: ${{ steps.extract_release_tag.outputs.VERSION }}
    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

      - name: Get Release Tag
        id: extract_release_tag
        run: |
          # Extract version from tag (e.g., refs/tags/v1.2.3 -> 1.2.3)
          TAG="$GITHUB_REF"
          TAG=${TAG#refs/tags/v}

          # Validate the extracted tag format
          if [[ ! "$TAG" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.-]+)?(\+[a-zA-Z0-9.-]+)?$ ]]; then
            echo "❌ Error: Invalid release tag format after extraction. Must be semver (e.g., 1.2.3, 1.2.3-alpha)"
            echo "Original ref: $GITHUB_REF"
            echo "Extracted tag: $TAG"
            exit 1
          fi

          # Safely add to environment variables
          echo "RELEASE_TAG=$TAG" >> $GITHUB_ENV

          echo "VERSION=$TAG" >> $GITHUB_OUTPUT
          echo "Using tag-based version: $TAG"

      - name: Update package.json version
        run: |
          sed -i "s/\"version\": \"0.0.0\"/\"version\": \"${{ env.RELEASE_TAG }}\"/" ./package.json
          cat ./package.json | grep version

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0

      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
        with:
          username: ${{ env.REGISTER_USERNAME }}
          password: ${{ env.REGISTER_PASSWORD }}
          registry: ${{ env.REGISTRY }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5.9.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            # Default semver tags (version, major.minor, major)
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            # Only tag as 'latest' for stable releases (not prereleases)
            type=raw,value=latest,enable=${{ !inputs.IS_PRERELEASE  }}

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

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64 # we target only amd64 for our k8s clusters
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      # Sign the resulting Docker image digest except on PRs.
      # This will only write to the public Rekor transparency log when the Docker
      # repository is public to avoid leaking data.  If you would like to publish
      # transparency data even for private images, pass --force to cosign below.
      # https://github.com/sigstore/cosign
      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}