runs pre-commit install on installation (terrible hack)
One of the strong design decisions of pre-commit is that each action is opted into. There's a common query / complaint that "hey pre-commit should just install when I install it!". This monstrosity implements that.
You should probably not use this, it's mostly a proof of concept. pip tries
pretty hard to make this difficult (as it should!). Running arbitrary code
in setup.py is not a good idea.