This is unnecessary hard in shell when compared to a proper programming
language. It becomes even easier with a node-js script, as that gives us
access to the underlying ESLint module rather than just the CLI interface.
Besides that, node-js has the added benefit that we don't need to add
more dependencies to the CI image.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1497
