Build Appimage CI artifact
Many linux distros have either outdated packages required for openmw or none at all, this can make it hard for users to quickly check new nightly's on their operating system.
Appimages provide a way for users to run a binary (usually) without having to compile multiple applications and libraries that aren't in thier package manager, and can make it easy to quickly test a nighty.
Edited by AnyOldName3