Fetch a list of all child PIDs before forwarding the termination signal.
Once the main process is terminated, forward that term signal to all found children also (if they are still running)
Goodbye Flatpak Sunshine. Hello AppImage.
Until a deb package is available for Debian Bookworm, we can just run sunshine as an AppImage.
It is faster to startup and is a little less bloated.
The goal here is to run Sunshine as a service managed by supervisord so that it is kept running and is restarted automatically if stopped.
