File _service of Package xfr

<services>
  <!-- cargo_vendor must be run manually: osc service manualrun cargo_vendor -->
  <!-- After running, commit xfr-*.tar.gz and vendor.tar.zst to OBS -->
  <service name="cargo_vendor" mode="manual">
    <param name="srctar">xfr-*.tar.gz</param>
    <param name="compression">zst</param>
    <param name="update">true</param>
  </service>
</services>