name: Build snapshot of PR

on: pull_request

env:
  REGISTRY_IMAGE: ghcr.io/museofficial/muse

jobs:
  build:
    name: Build snapshot
    strategy:
      matrix:
        runner-platform:
          - ubuntu-latest
          - namespace-profile-default-arm64
        include:
          - runner-platform: ubuntu-latest
            build-arch: linux/amd64
            tagged-platform: amd64
          - runner-platform: namespace-profile-default-arm64
            build-arch: linux/arm64
            tagged-platform: arm64
    runs-on: ${{ matrix.runner-platform }}
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.build-arch }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: type=ref,event=pr

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Get current time
        uses: josStorer/get-current-time@v2
        id: current-time

      - name: Build
        id: build
        uses: docker/build-push-action@v6
        with:
          outputs: type=docker,dest=/tmp/image.tar
          tags: ${{ steps.meta.outputs.tags }}
          platforms: ${{ matrix.build-arch }}
          build-args: |
            COMMIT_HASH=${{ github.sha }}
            BUILD_DATE=${{ steps.current-time.outputs.time }}

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload image
        uses: actions/upload-artifact@v4
        with:
          name: image-${{ env.PLATFORM_PAIR }}
          path: /tmp/image.tar
          if-no-files-found: error
          retention-days: 1

      - name: Save PR number in artifact
        shell: bash
        env:
          PR_NUMBER: ${{ github.event.number }}
        run: echo $PR_NUMBER > /tmp/pull_request_number.txt
      - name: Upload PR number
        uses: actions/upload-artifact@v4
        with:
          name: pull_request_number
          path: /tmp/pull_request_number.txt
          overwrite: true