Verify flatpak package / provide official package

[Glitchy-Tozier]

Is your feature request related to a problem? Please describe.

In Flathub, Darktable is listed as unverified. Some linux distros actively discourage you from installing such unverified packages (see below the Linux Mint software manager). This is bad for discoverability and user trust.

Describe the solution you'd like

Since this issue mentioned that the current package isn't official, I'd like to suggest creating and publishing an official build. Since there's already a community package, copying that workflow and creating an official release should be doable.

Alternatives

Additional context

[ralfbrown]

Thanks for volunteering to become maintainer of the official flatpak release! :)

More seriously, to have official releases for anything other than plain Linux executables, the project needs someone who commits to ensuring that the builds work and are created at the appropriate times and will follow up on bug reports for that variant. If nobody had stepped up when the previous Mac maintainer decided to step down a few years ago, there wouldn't currently be a MacOS release....