Port Sunshine for remote desktop use

[linkion]

Hello, I'm trying to setup sunshine to be used alongside tailscale with Aurora, but it seems that I can't install it without the workaround that's been applied on the bazzite side, because attempting to apply
sudo setcap cap_sys_admin+p $(readlink -f $(which sunshine))
results in
Failed to set capabilities on file '/usr/bin/sunshine-v2024.1208.41026': Read-only file system

To get around this, bazzite has a system-level systemd service to apply this.

I believe we could just copy paste the existing just from bazzite.
https://github.com/ublue-os/bazzite/blob/main/system_files/desktop/shared/usr/share/ublue-os/just/82-bazzite-sunshine.just