feat: create a Flatpak package

[jsj1027]

Could this be setup in a Flatpak? I am not fully aware of how well Flatpaks work with command line applications(quickemu), but it would really great if I could install quickgui and quickemu by extension without ppas.

[marxjohnson]

There was an attempt at making a snap, but I dont think containerised formats are really ideal for quickemu and quickgui, as a lot of their operation relies on calling out to other programs on the system.

[imxade]

it would be great to have it.

[alex-pex]

Gnome can do it with their Boxes app, I don't know how hard it must be to do it, but it shouldn't be impossible. (don't get me wrong, I'm not saying it's easy and you should do it. I just don't understand why it would be impossible for Quickgui to do the same thing as Boxes)

If you don't do a flatpak, can you consider building a rpm file? EDIT: already mentionned elsewhere #90

[ItsRogueRen]

There was mention of an appimage release, why is that not used? Appimage has its issues and quirks but it would at least give most stuff outside Ubuntu a way to use it without compiling from source (which btw if you're gonna add a link for how to set up flutter, please don't make it a link for how to do it in Ubuntu. If they're clicking that link more than likely they are not on Ubuntu lol).