docker-publish.yml

name: Docker

on:
  push:
    branches:
      - master

jobs:
  push_to_registries:
    name: Build Docker image and Push to both Dockerhub and Github Container-Registry 
    runs-on: ubuntu-latest

    steps:
      - name: Check out the repo
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Log into Dockerhub registry
        run: echo "${{ secrets.PASSWORD_DOCKERHUB }}" | docker login -u ${{ secrets.USERNAME_DOCKERHUB }} --password-stdin
          
      - name: Log into Github registry
        run: echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u $GITHUB_ACTOR --password-stdin

      - name: Build and push the images
        run: |
          # Identify Dockerfile changes across the repo and build/push the corresponding image
          # to both Dockerhub and Github repos.
          for filePath in $(git diff-tree --no-commit-id --name-only -r ${{ github.sha }} ${{ github.event.before }} | grep "Dockerfile");
          do
            folder=${filePath%"/Dockerfile"}
            IMAGE_NAME=${folder##*/}

            tmpName="image-$RANDOM"
            docker build $folder --file $folder/Dockerfile --tag $tmpName

            IMAGE_ID_DOCKERHUB=${{ secrets.USERNAME_DOCKERHUB }}/$IMAGE_NAME
            IMAGE_ID_GITHUB=ghcr.io/${{ secrets.USERNAME_GITHUB }}/$IMAGE_NAME

            echo IMAGE_ID=$IMAGE_ID
            echo VERSION=$VERSION

            docker tag $tmpName $IMAGE_ID_DOCKERHUB:latest
            docker push $IMAGE_ID_DOCKERHUB:latest
            
            docker tag $tmpName $IMAGE_ID_GITHUB:latest
            docker push $IMAGE_ID_GITHUB:latest
          done;