Ubuntu 22 breaks support for running App Images

[jgresham]

Problem details

Installing a dependency using the terminal is required to run an App Image on Ubuntu 22. See: https://askubuntu.com/questions/1403811/appimage-on-ubuntu-22-04

NiceNode should use Ubuntu's recommended format for app installation, which appears to be using Snapcraft https://ubuntu.com/desktop/developers

More info on Snap and electron apps:
https://snapcraft.io/#electron
https://www.electron.build/configuration/snap

[corn-potage]

Sorry, I thought I'd be able to give this a try, but it might be better if somebody else more familiar with build related stuff takes this on

[jgresham]

switching to .deb by default, but will also build AppImage and snap. Will try to publish to snap store in future.

Future linux build targets could include any of the following supported by electron build https://www.electron.build/configuration/linux#linuxtarget