File _service of Package calamares

<services>
 <service name="download_url">
  <param name="url">https://api.github.com/repos/calamares/calamares/releases/latest</param>
 </service>
 <service name="set_version">
  <param name="fromfile">_service:download_url:latest</param>
  <param name="regex">.*"tag_name"\s*:\s*"v(.*)"</param>
 </service>
 <service name="download_files">
 </service>
</services>