Use AppData in Linux builds

[ai]

In #524 we added appdata.xml file to the repository. In this PR we are using it during install scripts for Linux.

• I added AppData to Debian script according to Debian guideline
• I didn’t check AppImageKit, but according to it’s sources AppImageKit should load AppData from appDir/

@dagheyman We will need a release after merging this PR to start working for Flatpak.

[dagheyman]

Actually, we currently don't publish any debian packages ourselves (there is an effort to do it elsewhere though, see #328 (comment)). So I was planning on removing the whole debian/ folder from the repository. Are those files used directly by Flatpak ?

The appimage part of the PR looks fine.

[ai]

Do you build deb or rpm? I thought that AppImageKit is used for it.

[dagheyman]

No, its only used for the .AppImage found on https://developers.yubico.com/yubioath-desktop/Releases/

[ai]

It is strange that you build not so popular AppImage and not more popular snap or Flatpak 😅

OK, with this new information I need a day for investigating.

[ai]

Seems like we do not need anything special for Flatpak. I will update flathub/flathub PR on weekend.

I think AppImage can still win from AppData: https://docs.appimage.org/packaging-guide/appstream.html

If we have debian/ let’s update them as well. At least for theoretical consistency, rather than rational reasons.

But yeap, we do not need a release.

[dagheyman]

Thanks for clarifying. Merging this, with the caveat that the whole debian directory will probably be removed soon.