Distribute Psst through Flathub

[Peque]

It would be great to have Psst build as Flatpak and distributed through Flathub (the most popular Flatpak store).

Flatpaks, and in particular Flathub as a package "store" are becoming more popular and adopted in many Linux distributions. Some distributions, like Fedora Silverblue, even use an immutable system, which means the recommended way of installing packages is via Flathub to avoid layering unnecessary packages on the system.

[SO9010]

Ah, the thing I wrote yesterday didn't save, but I had a further look into this. It is still very much in the process of getting put into the flatpack store, and there are issues. It's not really being worked on anymore. When I have more time, I'll look into if I can help further.

Here are the relevant issues and PRs: #141 flathub/flathub#4151

If you have a look there and you have ideas on how you could help, please feel free to add a message.