core/.github/workflows/autopublish.yml

name: Publish package to GitHub Packages
on: [push]
jobs:
  publishing:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: |
            ref="${github_ref////.}"
            echo "::set-env name=ref::$ref"
        env:
          github_ref: ${{ github.ref }}
      - uses: actions/setup-java@v1
        with:
          java-version: 1.8
      - name: prebuild
        run: ./gradlew clean build
      - name: Publish package
        run: ./gradlew --no-parallel publishAllPublicationsToGithubPackagesRepository
        env:
          GITHUBPACKAGES_USER: ${{ secrets.GITHUBPACKAGES_USER }}
          GITHUBPACKAGES_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
          additional_version: "-$ref-build${{ github.run_number }}"