ci: add luals workflow

[clason]

Optional for now; can be run locally with make luacheck. (I just want to see how bad this is going to be...)

Also fix the lint workflow:

• no need to run as root
• format ALL THE FILES (there are Lua files outside /lua these days)

[clason]

Diagnosis complete, 2349 problems found

...pretty bad.

[Conni2461]

yeah, we dont have typing, luals wasnt that mature back then 😅

[clason]

I guess all these luacats annotations we have are for something different then ;)

[clason]

Note to self: This requires adapting the branch protection (required checks are case sensitive).

[clason]

yeah, we dont have typing, luals wasnt that mature back then 😅

Since we're basically starting from scratch, we might as well switch to emmyluals already, which is quite a bit faster and has better support for generics. (It's also quite a bit stricter and still has some rough edges, and the Nvim runtime itself is not fully emmyluals compliant, which may be a problem.)

[Conni2461]

I guess all these luacats annotations we have are for something different then ;)

annotations where used for doc generation, not type hints: https://github.com/tjdevries/tree-sitter-lua/blob/master/HOWTO.md but i think that one broke 2 years ago

[clason]

Yeah, I noticed on another PR (which is what started this whole rampage) ;)

[clason]

emmyluals has a docgen CLI; that could be another argument for switching, if we have to replace tools anyway.