Use Deb package repo for upgrading on Linux
As an end-user, I want to use the package update system I already use, in order to save effort.
Provide packages through repos to simplify updates using dnf, apt or other package managers.
GitKraken already packages the app in various package formats such as rpm and deb. It shouldn't be a great effort to put them on a webserver and run create_repo (or whichever tool the given package format provides).