[Feature Request]: Distribute flatpakref file for easier install

[Thesola10]

What the feature is suppose to do

A .flatpakref file contains a reference to a Flatpak on a repository, and allows for adding all required repositories in one go. The user experience of a .flatpakref is that it is opened by the app store (GNOME Software, Discover) as the "about page" for the application.

Describe the reason behind the request

This is simpler than the commands listed, and would allow the flatpak to be listed in the Releases page.

Oh, I almost forgot: a flatpakref can contain a signing key, which makes installing the program safer.

[Thesola10]

Example .flatpakref for this app:

[Flatpak Ref]
Name=com.gitlab.KRypt0n_.an-anime-game-launcher
Branch=master
Title=An Anime Game Launcher
IsRuntime=false
Url=https://gol.launcher.moe/repo/
SuggestRemoteName=launcher.moe
GPGKey=xxxxx
RuntimeRepo=https://dl.flathub.org/repo/flathub.flatpakrepo

Notice the ability to specify a third-party runtime repo in the same file

[Mar0xy]

a flatpakref can contain a signing key, which makes installing the program safer.

By default flatpakref files don't contain a signing key the key is provided by the repo file itself unless added in after the fact

as well as easy(ish) downgrade if needed.

This is false as the flatpakref pulls the info from the repo yet again so you still need to figure out stuff yourself to downgrade it by commits.

Here is an example of the flatpakref for the GTK launcher that got generated

Overall this would have no benefit besides auto-adding flathub which makes this kind of redundant since no one has complained about this so far.

[Thesola10]

thought it was worth considering from a UX POV

as well as easy(ish) downgrade if needed.

yeah i took that back soz