release.yml

name: 'Release a new version to Github Packages'

on:
    release:
        types: [published]

env:
    REGISTRY: ghcr.io

jobs:
    push_to_registry:
        name: Push Docker image to GitHub Packages tagged with "latest" and version number.
        runs-on: ubuntu-latest
        steps:
            - name: Check out the repo
              uses: actions/checkout@v2
            - name: Get the version
              id: get_version
              run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
            - name: Extract metadata (tags, labels) for Docker
              id: meta
              uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
              with:
                images: 
                    ghcr.io/${{ github.repository }}
            - name: Login to ghcr
              uses: docker/login-action@v1
              with:
                  registry: ${{ env.REGISTRY }}
                  username: ${{ github.actor }}
                  password: ${{ secrets.GITHUB_TOKEN }}
            - name: Push to GitHub Packages
              uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
              with:
                  context: .
                  push: true
                  tags: ${{ steps.meta.outputs.tags }}
                  labels: ${{ steps.meta.outputs.labels }}
                  build-args: BRANCH_NAME=${{ github.event.release.target_commitish }}