Publish as a Flatpak to Flathub

[bbb651]

I know this is a little early for this sort of stuff, but I intend to work on it myself and mostly wanted to get some feedback if this is even wanted, ideally this would be marked as verified on flathub.
I think org.freedesktop.Platform//23.08 is a good runtime to target, with the org.freedesktop.Platform.GL.default//23.08 extension for graphics and the sdk for dotnet 8 org.freedesktop.Sdk.Extension.dotnet8.
Here the official documentation for building a flatpak, and the repo for the sdk has some instructions.

[mariomadproductions]

An Appimage might be a good idea too (or instead), since they can work portably.