File _servicedata of Package read-only-root-fs

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/openSUSE/read-only-root-fs.git</param>
    <param name="changesrevision">d85232a9c138eb6dc768c97ac3a5b2d80c16b7e6</param>
  </service>
</servicedata>