maloja/.github/workflows/dockerhub.yml

name: Publish Docker image to Dockerhub

on:
  push:
    branches:
      - 'master'
    tags:
      - '*.*.*'
    # don't trigger if just updating docs
    paths-ignore:
      - '**.md'

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2
      
      - name: Log in to Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: krateng/maloja
          # generate Docker tags based on the following events/attributes
          tags: |
            type=raw,value=latest,enable=${{ endsWith(github.ref, 'master') }}
            type=ref,event=branch,enable=${{ !endsWith(github.ref, 'master') }}
            type=semver,pattern={{version}}            
          flavor: |
            latest=false            
      
      - name: Build and push Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}