currently, after the first bin/update run that deploys pre-commit elsewhere,
every subsequent bin/update run (or "mr update" in fact) will be noise in the
following way:
mr update: /home/zack/dati/projects/sw-heritage/git/swh-environment/swh-search Already up to date. Running in migration mode with existing hooks at .git/hooks/pre-commit.legacy Use -f to use only pre-commit. pre-commit installed at .git/hooks/pre-commit
with this change we avoid re-running "pre-commit install" if pre-commit has
already been installed for a given repo in the past