build_docker_image.yml

name: Build docker image and push to registry
on: push
jobs: 
  publish_docker:
    runs-on: ubuntu-latest
    if: (github.ref == 'refs/heads/master') && (github.repository_owner == 'TroupeLang') 
    steps:
      - uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: build and push docker image
        uses: docker/build-push-action@v4
        with:
          push: true
          tags: ghcr.io/troupelang/troupe:latest