Can we have a cop to recommend not using Dir.chdir?

[timdiggins]

Is your feature request related to a problem? Please describe.

I was recently bitten by the issue that Dir.chdir (including with a block) actually affects the process (rather than somehow being local to the ruby thread ) and thus is non threadsafe.

Describe the solution you'd like

A built in cop to ban Dir.chdir.
Ruby 3.0 throws an error if you try to chdir within another chdir (from another thread) https://bugs.ruby-lang.org/issues/15661

Describe alternatives you've considered

It's possible to use this code more or less as is: https://gist.github.com/masutaka/68d372b7f7910f552eeb215bb2e5d3cc

but think it would be good to have it built in. Thoughts?

[koic]

This probably looks like an issue handled by RuboCop::ThreadSafety rather than RuboCop core.
https://github.com/rubocop/rubocop-thread_safety