I upgraded to v4 action and now get "Can't determine root folder." I can't figure out how to fix it.

This is for e2e tests, where we check out the code under test to a subdirectory, "frontend". This worked fine, without any options on v3. How do I fix it for v4?

Line that is thrown is here: https://github.com/codecov/codecov-cli/blob/main/codecov_cli/helpers/versioning_systems.py#L109

As far as I can tell, this doesn't use any passed in CLI option? So there's no way to configure it for the subdir.