Checkout is missing top-level config folder

[Flamefire]

I'm using this action in the most simple way: uses: actions/checkout@v2

I recently created a commit which moves some files into a folder config. The diff shows it and all looks fine. But when running CI that folder is missing entirely. I can't imagine why but that this action removes it somehow.

See e.g. https://github.com/boostorg/nowide/pull/113/checks?check_run_id=1160708123