File _service of Package spirv-headers

<services>
  <service name="tar_scm">
    <param name="scm">git</param>
    <param name="revision">main</param>
    <param name="url">https://github.com/KhronosGroup/SPIRV-Headers.git</param>
    <param name="without-version">enable</param>
    <param name="extract">include/spirv/unified1/spirv.core.grammar.json</param>
  </service>
  <service name="download_url">
    <param name="url">https://api.github.com/repos/KhronosGroup/SPIRV-Headers/tags</param> 
  </service>
  <service name="recompress" mode="buildtime">
    <param name="compression">xz</param>
    <param name="file">*.tar</param>
  </service>
  <service name="run" mode="buildtime">
    <param name="command">(echo -n 'Version: '; python3 regex.py spirv.core.grammar.json tags) > "${outdir}/version.ver"</param>
  </service>
  <service name="set_version" mode="buildtime">
    <param name="fromfile">version.ver</param>
  </service>
</services>