Do not populate the keys database with associated files,
because a bare repo has no working tree, and so it does not make sense to
populate it.
Queries of associated files in the keys database always return empty lists
in a bare repo, even if it's somehow populated. One way it could be
populated is if a user converts a non-bare repo to a bare repo.
Note that Git.Config.isBare does a string comparison, so this is not free!
But, that string comparison is very small compared to a sqlite query.
Sponsored-by: Erik Bjäreholt on Patreon
