File _service of Package obs-build

<services>
  <service name="download_src_package">
    <param name="host">download.opensuse.org</param>
    <param name="protocol">https</param>
    <param name="path">/repositories/openSUSE:/Tools/CentOS_8/src/obs-build-20200828-362.4.src.rpm</param>
  </service>
</services>