build-on-push.yaml

name: "Building & push docker image for master and develop branch"
on:
  push:
    branches:
    - master
    - develop

jobs:
  docker-build:
    timeout-minutes: 5
    runs-on: ubuntu-latest
    steps:
      - name: "Checking out the repository"
        uses: actions/checkout@v2
      - name: "Calculating the docker image tag"
        if: github.repository == 'mviewer/mviewer'
        id: version
        run: |
          if [[ $GITHUB_REF == 'refs/heads/master' ]]; then
            echo ::set-output name=VERSION::stable
          elif [[ $GITHUB_REF == 'refs/heads/develop' ]]; then
            echo ::set-output name=VERSION::latest
          else
            echo "This action only works with master or develop branch"
            exit 1
          fi

      - name: "build the container"
        if: github.repository == 'mviewer/mviewer'
        run: |
          docker build -t mviewer/mviewer:${{ steps.version.outputs.VERSION }} .

      - name: "Log onto docker hub"
        if: github.repository == 'mviewer/mviewer'
        uses: azure/docker-login@v1
        with:
          username: '${{ secrets.DOCKER_HUB_USERNAME }}'
          password: '${{ secrets.DOCKER_HUB_PASSWORD }}'

      - name: "push the container"
        if: github.repository == 'mviewer/mviewer'
        run: |
          docker push mviewer/mviewer:${{ steps.version.outputs.VERSION }}