Docs: Using the provided alias with `COREOS_ASSEMBLER_CONFIG_GIT` leave FS with dangling files

If you set COREOS_ASSEMBLER_CONFIG_GIT=/some/path/ the current alias will mount /some/path into /srv/src/config into the container.

This allow having a clone of fedora-coreos-config wherever you want. It works well, but leaves some stuff on your FS.
Indeed, the alias also have -v ${PWD}:/srv set up. Which cause a weird file created in your local FS.

To reproduce:

cd ~
cosa shell #because you just want to check a rpm version or something
exit

# back in the host ~
ls -l 
drwxr-xr-t. 1 nobody nobody      12 May 28 16:06  src
ls -l src/
drwxr-xr-t. 1 nobody nobody 0 May 28 16:06 config

I can only delete those using root. I realize it's a bit of a corner case but I don't really know how it can be fixed 🤷
I'm referencing this alias : https://coreos.github.io/coreos-assembler/building-fcos/#define-a-bash-alias-to-run-cosa

Start with the bash alias shown in the linked CoreOS Assembler documentation and reproduce it from a home directory using cosa shell with COREOS_ASSEMBLER_CONFIG_GIT set. Trace the two mounts and verify that exiting the container no longer leaves dangling src/config entries requiring root removal.