command line too long

Hi guys, we have an issue with the nightlies on mac

https://gitlab.idiap.ch/bob/bob.nightlies/-/jobs/166296/raw

Basically the command git clean -ffdxq --exclude=miniconda.sh --exclude=miniconda/pkgs/urls.txt ........ is getting too long.

I think this limit is hard-coded in the bash, no? https://unix.stackexchange.com/questions/120642/what-defines-the-maximum-size-for-a-command-single-argument

ping @andre.anjos @amohammadi