name: Builder Image

on:
  schedule:
    - cron: "0 3 * * 1"  # Every Monday at 3 AM
  push:
    paths:
      - "ci.Dockerfile"
      - ".github/workflows/builder-image.yml"

env:
  REGISTRY_IMAGE: jguer/yay-builder

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm/v7
          - linux/arm64
    steps:
      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Set up QEMU
        uses: docker/setup-qemu-action@ce360397dd3f832beb865e1373c09c0e9f86d70a # v4.0.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0

      - name: Login to GitHub Container Registry
        uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4.2.0
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@80c7e94dd9b9319bd5eb7a0e0fe9291e23a2a2e9 # v6.1.0
        with:
          images: |
            ghcr.io/${{ env.REGISTRY_IMAGE }}
          tags: |
            type=raw,value=latest
            type=sha,format=long

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
        with:
          context: .
          file: ci.Dockerfile
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=ghcr.io/${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          echo -n "$digest" > "/tmp/digests/$(echo "${{ matrix.platform }}" | tr '/' '_')"

      - name: Upload digest
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: digest-${{ matrix.platform == 'linux/amd64' && 'amd64' || matrix.platform == 'linux/arm/v7' && 'armv7' || 'arm64' }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    needs: [build]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Download digests
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          pattern: digest-*
          merge-multiple: true
          path: /tmp/digests

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0

      - name: Login to GitHub Container Registry
        uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4.2.0
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@80c7e94dd9b9319bd5eb7a0e0fe9291e23a2a2e9 # v6.1.0
        with:
          images: |
            ghcr.io/${{ env.REGISTRY_IMAGE }}
          tags: |
            type=raw,value=latest
            type=sha,format=short

      - name: Create and push manifest list
        env:
          DOCKER_CLI_EXPERIMENTAL: enabled
        run: |
          # Extract GitHub Container Registry tags
          GHCR_TAGS=$(echo '${{ steps.meta.outputs.tags }}' | xargs -I {} echo "-t {}")
          
          # Create a manifest list using the image digests from /tmp/digests/*
          DIGESTS=$(for file in /tmp/digests/*; do
            echo -n "ghcr.io/${{ env.REGISTRY_IMAGE }}@$(cat $file) "
          done)
          
          # Create the manifest list for GitHub Container Registry
          docker buildx imagetools create $GHCR_TAGS $DIGESTS

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ghcr.io/${{ env.REGISTRY_IMAGE }}:latest