build-and-push-docker-multiarch-image.yml

name: Docker Image Build and Push - CI Workflow

on:
  push:
    branches:
      # master handles: "latest"; and tags "minimal" and "alpine-minimal"
      - master
      # alpine-extra handles itself "alpine-extra"; and tag "extra" 
      - alpine-extra
    
    tags:
      - minimal
      - alpine-minimal
      - extra

jobs:
  build-and-push-muti-arch-docker-image:
    runs-on: ubuntu-latest
    env:
      DOCKER_IMAGE: network-multitool
      DOCKERHUB_ORGNAME: praqma
      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
      # 
      # DOCKERHUB_USERNAME and DOCKERHUB_TOKEN are to be set in the GITHUB WEB UI,
      #   under RepoName -> Settings -> Secrets
    
    steps:

      - name: Checkout
        uses: actions/checkout@v2

      - name: Prepare Docker Image Tags
        id: prep
        run: |
          SHORT_REF=$(basename ${GITHUB_REF})
          SHORT_HASH=${GITHUB_SHA::7}
          TAGS=""
          if [[ ! -z "${SHORT_REF}" && "${SHORT_REF}" == "master" ]]; then 
            echo "Found git commit on master branch. Setting docker image tag as: 'latest'" 
            TAG=${DOCKERHUB_ORGNAME}/${DOCKER_IMAGE}:latest
          fi  
          if [[ ! -z "${SHORT_REF}" && "${SHORT_REF}" != "master" ]]; then 
            echo "Setting docker image tag as: '${SHORT_REF}'" 
            TAG=${DOCKERHUB_ORGNAME}/${DOCKER_IMAGE}:${SHORT_REF}
          fi
          TAGS="${TAG},${DOCKERHUB_ORGNAME}/${DOCKER_IMAGE}:${SHORT_HASH}"
          echo "Complete Docker image-name and tags are setup as: ${TAGS}"
          echo ::set-output name=tags::${TAGS}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to DockerHub
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/386,linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
          push: true
          tags: ${{ steps.prep.outputs.tags }}