fix(ci): 🐛 Enable GPL on linux build and remove AppImage from CI

[Meister1593]

Same deal as on nightlies

Merge only after it gets tested at least on nightlies, otherwise i don't know if it works on nvidia (double-checking removal of nc-codec-headers)

[Meister1593]

...theres literally no code change, and it ran just fine before i change commit name

ignore macos check?...

[zarik5]

Yeah it likes to fail on alvr_packets for some reason

[MadByteDE]

Sry for asking but why removing AppImages? They worked just fine for me on nvidia.

[PassiveLemon]

I'm interested in why as well.

[Meister1593]

AppImages weren't required anymore (almost everything is bundled into alvr as static library now, appimage reason for being portable is nulled at this point) and it was maintenance burden that no one knew how to properly maintain, thus it was removed as unnecessary.

[guysoft]

Hey, so I am trying to run the linux build and its crashing. I am not sure why, but this did not happen with the appimage. Is there a way to figure what is missing in the native build?

[Meister1593]

@guysoft please open new issue and provide output of ldd bin/alvr_dashboard and lib64/alvr/bin/linux64/driver_alvr_server.so with it
as well as system and other information of course

[mAd-DaWg]

@Meister1593 for the same reason please remove flatpack, as the exact same logic applies

[Meister1593]

Flatpak is made fairly differently but removing flatpak build is planned as well. Just need to update instructions how to use with tar instead of it. It might be also possible to use it with nvidia that way.