name: Docker Publish

# Only publish when a semver tag is created:
# https://github.com/bigbrainenergy-org/web.tdl.app/releases/new
on:
  push:
    # branches: ['main']
    # Publish semver tags as releases.
    tags: ['v*.*.*']

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}
  # Get the docker image tag, e.g. `v0.0.1`
  TAG_NAME: ${{ github.ref_name }}

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      actions: read
      attestations: write
      contents: write
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      # 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@v3 #v3.1.1
        with:
          cosign-release: 'v2.1.1'

      # Set up BuildKit Docker container builder to be able to build
      # multi-platform images and export cache
      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3 # v3.0.0

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3 # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5 # v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      # 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@v5 # v5.0.0
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # 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
      # FIXME: The signing step is broken, I can't tell why, and I don't care about fixing it that much atm
      # - 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}

      # 😒🫸 Signing and attestation?
      # 😏👉 SBOM for no particular reason?
      - name: Anchore SBOM Action
        uses: anchore/sbom-action@v0
        with:
          upload-release-assets: true
          image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.TAG_NAME }}