publish.yaml

name: Publish Docker image

on:
  release:
    types: [published]

jobs:
  buildx:
    name: Multi-arch build and publish
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
    steps:
      - name: Verify if release is SemVer-compatible
        run: perl -e "exit 0 if ('$VERSION' =~ m/^v?(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/); exit 1"
        env:
          VERSION: ${{ github.event.release.tag_name }}

      - name: Checkout
        uses: actions/checkout@v2

      - name: Detect Node version
        id: node_version
        run: echo "::set-output name=version::$(<.nvmrc)"

      - name: Extract metadata from GitHub Action context
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}
          tags: type=semver,pattern={{version}}

      - name: Install Cosign
        uses: sigstore/cosign-installer@main

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ github.token }}

      - name: Verify base image signature
        run: cosign verify --key .keys/distroless.pub gcr.io/distroless/nodejs:$NODE_VERSION
        env:
          NODE_VERSION: ${{ steps.node_version.outputs.version }}

      # https://github.com/GoogleContainerTools/distroless/issues/975
      # - name: Verify base image provenance
      #   run: cosign verify-attestation --key .keys/distroless.pub gcr.io/distroless/nodejs:$NODE_VERSION
      #   env:
      #     NODE_VERSION: ${{ steps.node_version.outputs.version }}

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: node_version=${{ steps.node_version.outputs.version }}

      # Visit the following repos for more options:
      # https://github.com/sigstore/cosign-installer
      # https://github.com/sigstore/cosign
      - name: Sign the image with GitHub OIDC **EXPERIMENTAL**
        run: cosign sign --force=$FORCE --oidc-issuer https://token.actions.githubusercontent.com ${TAGS}
        env:
          COSIGN_EXPERIMENTAL: 1
          FORCE: ${{ github.event.repository.private }}
          TAGS: ${{ steps.meta.outputs.tags }}