Search for portable Jellyfin media server projects. It looks like there’s a few out there.
If you’re going to use this in a car, it needs to be as simple as plugging in a single device and powering it on. An over-engineered solution is going to quickly turn into a headache.
To me, if Valve wants Linux multiplayer to have a future, they need to demonstrate that they can develop a good Linux anti-cheat solution.
That’s much easier said than done. But I hope it’s a problem that they’re working on. Otherwise, it’s going to limit the potential of the Steam Deck and other future Valve Linux hardware.