File _service of Package ghostty-unstable

<services>
  <service name="download_url" mode="manual">
    <param name="url">https://github.com/ghostty-org/ghostty/releases/download/tip/ghostty-source.tar.gz</param>
  </service>

<!--
  <service mode="manual" name="recompress">
    <param name="file">ghostty-source.tar.gz</param>
    <param name="compression">zst</param>
  </service>
  <service mode="manual" name="set_version"/>
-->
</services>