File _service of Package waydroid-image

<services>
  <service name="obs_scm">
    <param name="scm">git</param>
    <param name="url">https://github.com/itachi-re/waydroid-image-obs.git</param>
    <param name="revision">main</param>

    <param name="extract">waydroid-image.spec</param>
    <param name="extract">_multibuild</param>
  </service>

  <service name="download_files"/>
</services>