Like, GitHub actions could afford to crappy if you rarely had to deal with them. It would be better if you did in fact have JS...

But GH actions take multiple minutes to run, and a linter is near instant.

A less powerful solution would be saying "Here's some prefab instant actions that don't spin up a new container, just tell us what paths to include in for this linter and this formatter and click this box, and since we control it we can optimize it and fix the bugs and all that".

People invent DSLs instead of just exposing code often because they want it to be easy and expressive, but they make the easy things moderately hard, and the hard things near impossible.

But if the easy common things are just built in, you don't need any DSL at all, and you're not tempted to, because you just say "We cover common stuff already, if you want to do weird stuff we have Python for that".

But for some reason programmers would rather spend 10x the effort on a custom system rather than implement a specific common feature, because they want everything to be like a math equation, a description of something general.

Back in the early desktop era, adding stuff just because X fraction of users want it seemed to be all the rage, now people add things based on whether it fits with a vision or an idea.