File _service of Package build

<services>
 <service name="tar" mode="buildtime">
   <param name="filename">obs-build</param>
   <param name="version">_none_</param>
 </service>
 <service name="recompress" mode="buildtime">
   <param name="file">*.tar</param>
   <param name="compression">gz</param>
 </service>
</services>