name: Publish Docker image

on:
  schedule:
    - cron: '24 0 * * 1'
  workflow_dispatch:
  push:
    branches:
      - 'master'
    tags:
      - 'v*'
  pull_request:
    branches:
      - 'master'

env:
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write # needed for signing the images with GitHub OIDC Token
      attestations: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 1

      # 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@v3.3.0
        with:
          cosign-release: 'v2.2.2'

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to GitHub Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata app
        id: meta-app
        uses: docker/metadata-action@v4.4.0
        with:
          images: ghcr.io/${{ env.IMAGE_NAME }}-app
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,format=long

      - name: Extract Docker metadata backend
        id: meta-backend
        uses: docker/metadata-action@v4.4.0
        with:
          images: ghcr.io/${{ env.IMAGE_NAME }}-backend
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,format=long

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and Push App container images
        uses: docker/build-push-action@v4
        id: build-and-push-app
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta-app.outputs.tags }}
          labels: ${{ steps.meta-app.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          file: ./app.dockerfile

      - name: Build and Push Backend container images
        uses: docker/build-push-action@v4
        id: build-and-push-backend
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta-backend.outputs.tags }}
          labels: ${{ steps.meta-backend.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          file: ./backend.dockerfile

      - name: Sign the app images with GitHub OIDC Token
        env:
          DIGEST: ${{ steps.build-and-push-app.outputs.digest }}
          TAGS: ${{ steps.meta-app.outputs.tags }}
        run: |
          images=""
          for tag in ${TAGS}; do
            images+="${tag}@${DIGEST} "
          done
          cosign sign --yes ${images}

      - name: Sign the backend images with GitHub OIDC Token
        env:
          DIGEST: ${{ steps.build-and-push-backend.outputs.digest }}
          TAGS: ${{ steps.meta-backend.outputs.tags }}
        run: |
          images=""
          for tag in ${TAGS}; do
            images+="${tag}@${DIGEST} "
          done
          cosign sign --yes ${images}

      - name: Attest app
        uses: actions/attest-build-provenance@v1
        id: attest-app
        with:
          subject-name: ghcr.io/${{ env.IMAGE_NAME }}-app
          subject-digest: ${{ steps.build-and-push-app.outputs.digest }}
          push-to-registry: true

      - name: Attest backend
        uses: actions/attest-build-provenance@v1
        id: attest-backend
        with:
          subject-name: ghcr.io/${{ env.IMAGE_NAME }}-backend
          subject-digest: ${{ steps.build-and-push-backend.outputs.digest }}
          push-to-registry: true