build-and-publish.yaml

name: Create and publish a Docker image (test)

on:
  push:
    branches: ['main']

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  TMP_LOCAL_IMAGE: localhost:5000/qdlmcfresh/songbird-trivia
  REGISTRY_IMAGE: ghcr.io/qdlmcfresh/songbird-trivia
  REGISTRY_TAG: latest

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      -
        name: Prepare
        run: |
          mkdir -p /tmp/images
          platform=${{ matrix.platform }}
          echo "TARFILE=${platform//\//-}.tar" >> $GITHUB_ENV
          echo "TAG=${{ env.TMP_LOCAL_IMAGE }}:${platform//\//-}" >> $GITHUB_ENV

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

      - uses: docker/setup-buildx-action@v2

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          platforms: ${{ matrix.platform }}
          tags: ${{ env.TAG }}
          outputs: type=docker,dest=/tmp/images/${{ env.TARFILE }}
          #cache-from: type=gha
          #cache-to: type=gha,mode=max
        
      -
        name: Upload image
        uses: actions/upload-artifact@v3
        with:
          name: images
          path: /tmp/images/${{ env.TARFILE }}
          if-no-files-found: error
          retention-days: 1
  
  push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    needs:
      - build
    services:
      registry:
        image: registry:2
        ports:
          - 5000:5000
    steps:
      -
        name: Download images
        uses: actions/download-artifact@v3
        with:
          name: images
          path: /tmp/images
      -
        name: Load images
        run: |
          for image in /tmp/images/*.tar; do
            docker load -i $image
          done
      -
        name: Push images to local registry
        run: |
          docker push -a ${{ env.TMP_LOCAL_IMAGE }}
      -
        name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Create manifest list and push
        run: |
          docker buildx imagetools create -t ${{ env.REGISTRY_IMAGE }}:${{ env.REGISTRY_TAG }} \
            $(docker image ls --format '{{.Repository}}:{{.Tag}}' '${{ env.TMP_LOCAL_IMAGE }}' | tr '\n' ' ')
      -
        name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ env.REGISTRY_TAG }}