Recently, Guix started to set the environment GIT_SSL_CAINFO like a
search path, instead of pointing to single file, which is what it should
be.

This makes Git unable to access remotes over HTTPS. It show a message
like this:

fatal: unable to access 'https://example.com/repo.git': Problem with the
SSL CA cert (path? access rights?)

I think this used to work "out of the box", at least on GuixSD.