docker.yml

name: Build Docker Container

on:
  push:
    branches: ['**']
    tags: ["*.*.*"]
  pull_request:
    branches: ["main"]

env:
  REGISTRY: ghcr.io

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm/v6
          - linux/arm/v7
          - linux/arm64
          - linux/386
          - linux/ppc64le
          - linux/s390x

    steps:
      - 
        name: Checkout repository
        uses: actions/checkout@v4

      - 
        name: Convert image name to lowercase
        run: |
          GITHUB_REPOSITORY="${{ github.repository }}"
          echo "IMAGE_NAME=ghcr.io/${GITHUB_REPOSITORY,,}" >>${GITHUB_ENV}

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

      - 
        name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - 
        name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - 
        name: Build Docker image
        id: build
        uses: docker/build-push-action@v5
        with:
          context: .
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          platforms: ${{ matrix.platform }}
          provenance: true
          outputs: type=image,name=${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' }}

      - 
        name: Export digest
        if: ${{ github.event_name != 'pull_request' }}
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"
      - 
        name: Upload digest
        if: ${{ github.event_name != 'pull_request' }}
        uses: actions/upload-artifact@v3
        with:
          name: digests
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    if: ${{ github.event_name != 'pull_request' }}
    needs:
      - build
    steps:
      - 
        name: Convert image name to lowercase
        run: |
          GITHUB_REPOSITORY="${{ github.repository }}"
          echo "IMAGE_NAME=ghcr.io/${GITHUB_REPOSITORY,,}" >>${GITHUB_ENV}
      - 
        name: Download digests
        uses: actions/download-artifact@v3
        with:
          name: digests
          path: /tmp/digests
      - 
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - 
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME }}
      - 
        name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - 
        name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.IMAGE_NAME }}@sha256:%s ' *)
      - 
        name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}