restore test build in GitHub Actions

    runs-on: ubuntu-20.04

    runs-on: ubuntu-20.04

    steps:

    steps:

      - uses: actions/checkout@v2

      - uses: actions/checkout@v2

      - name: clean environment

        run: rm -rf tests whitelist sub

      - uses: docker/setup-buildx-action@v1

      - uses: docker/setup-buildx-action@v1

      - uses: docker/login-action@v1

      - uses: docker/login-action@v1

        with:

        with: