GHA: Initialize submodules

      - uses: actions/checkout@v2

      - name: perl -V

        run: perl -V

      - name: Initialize Submodules

        run: git submodule update --init

      - name: Install Dependencies

        run: curl -sL https://raw.githubusercontent.com/skaji/cpm/master/cpm | perl - install -g --show-build-log-on-failure

      - name: Prepare Build