docker-image.yml

name: Docker Image CI

on:
  push:
    branches: [main, Pr1]
  workflow_dispatch:

permissions:
  packages: write

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  # ===============================================================
  #   Building Dev Image
  # ===============================================================
  build_dev:
    strategy:
      max-parallel: 6
      matrix:        
        distro:
          - name: "alpine-dev"
            tag: latest
            file: alpine-dev.Dockerfile
          - name: "ubuntu-dev"
            tag: 20
            file: u20.04-dev.Dockerfile
          - name: "ubuntu-dev"
            tag: 22
            file: u22.04-dev.Dockerfile
          - name: "fedora"
            tag: 30
            file: fedora30-dev.Dockerfile
          - name: "ubuntu-dev"
            tag: 24
            file: u24.04-dev.Dockerfile
          # - container: "benchmark-dev:latest"
          #   file: benchmark-dev.Dockerfile
        image:
          - name: ubuntu-24.04
            arch: amd64
          - name: ubuntu-24.04-arm
            arch: arm64

    runs-on: ${{ matrix.image.name }}
    env:
      image_base: ghcr.io/${{ github.repository_owner }}/${{ matrix.distro.name }}      
    steps:
      - uses: actions/checkout@v4
      - uses: docker/setup-buildx-action@v3

      - name: GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Collect Docker metadata
        id: metadata
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.image_base }}

      - name: Build
        uses: docker/build-push-action@v6
        id: build
        with:
          context: .
          provenance: false
          platforms: linux/${{ matrix.image.arch }} 
          file: ${{ matrix.distro.file }}
          labels: ${{ steps.metadata.outputs.labels }}
          outputs: type=image,name=${{ env.image_base }},push-by-digest=true,name-canonical=true,push=true

      - name: Inspect Docker image
        run: |
          docker buildx imagetools inspect ${{ env.image_base }}:sha256@${{ steps.build.outputs.digest }}

      - name: Test Docker image
        run: docker run --rm "${{ env.image_base }}:sha256@${{ steps.build.outputs.digest }}" echo succeeded
  
      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"
      
      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.distro.name }}-${{ matrix.distro.tag }}-${{ matrix.image.arch }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge_manifest:
    needs: [build_dev]
    runs-on: ubuntu-latest
    strategy:
      matrix:
        image: 
          - name: alpine-dev
            tag: latest
          - name: ubuntu-dev
            tag: 20
          - name: ubuntu-dev
            tag: 22
          - name: ubuntu-dev
            tag: 24
          - name: fedora
            tag: 30
    env:
      image_base: ghcr.io/${{ github.repository_owner }}/${{ matrix.image.name }}
      image: ghcr.io/${{ github.repository_owner }}/${{ matrix.image.name }}:${{matrix.image.tag}}

    steps:
      - uses: docker/setup-buildx-action@v3
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-${{ matrix.image.name }}-${{ matrix.image.tag }}-*
          merge-multiple: true

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Collect Docker metadata
        id: metadata
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.image_base }}
      
      - name: Create and push merged image
        working-directory: /tmp/digests
        run: |
          tags=$(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON")
          images=$(printf '${{ env.image_base }}@sha256:%s ' *)
          echo "images: $images"
          docker buildx imagetools create -t ${{ env.image }} ${images}

      - name: Inspect Docker image
        run: |
          docker buildx imagetools inspect ${{ env.image }}