I’ll just leave this here, thank me later:

https://docs.linuxserver.io/images/docker-webtop/

These images are top-notch, well documented, and have recently been refactored to use Selkies under the hood. Even with gamepad support, I’ve used these for running DOSbox, RetroArch, streaming video, and many other things.

There’s even a mature extensibility layer for using their images as a base layer to add services and apps.

Can’t speak highly enough of the linuxserver.io folks.

I actually wanted to try webtop for a long time, and did it only recently. I could not figure out these selkies for the life of me. It wanted a bunch of ports, was complaining about something all the time (don't remember, it's been a month). Might be a skill issue, but I've been using docker for the past 10 years. Moreover they want root access to the host system, which kind of defies one of the reasons to use containers. Is there a video that explains the benefits in a good way? I mean, if it's for gaming only, I can understand the use-case, but say you just want to run something like Gnu Radio in a container, why would I need 60 fps and root permissions for that.