File _service of Package rpi-imager

<services>
  <service name="download_url">
    <param name="url">https://github.com/raspberrypi/rpi-imager/archive/refs/tags/v1.7.5.tar.gz</param>
    <param name="filename">rpi-imager_1.7.5.orig.tar.gz</param>
  </service>
</services>