Add some necessary files for the Flatpak

[jwillikers]

Related to #810.

[rmcrackan]

Sorry for the delay. Is this PR ready for my approval? After this is done, what else do I need to do so the linux folks can benefit from it? This is all greek to me

[jwillikers]

Sorry for the delay. Is this PR ready for my approval? After this is done, what else do I need to do so the linux folks can benefit from it? This is all greek to me

@rmcrackan I think it should be good. The only thing I haven't tested is the GitHub Actions, one of which will fail until this is merged. I set up the workflows to only run when the relevant files change, so even if I need to work out a kink, it shouldn't effect anyone else.

I'll help you through what comes next. Mostly just addressing the points here before we open a PR to Flathub up to submit the app. I'll help you through all of that part too.

[rmcrackan]

Cool. Here goes nothing.

[jwillikers]

@rmcrackan I'll fix that

[rmcrackan]

Gracias

[rmcrackan]

included in https://github.com/rmcrackan/Libation/releases/tag/v11.5.4