Hmmm, I’ve tested with the latest Docker release and I’m not getting this error 
The volume is mapped to the containers /home/node/.n8n folder. The cache folder is outside of that at /home/node/.cache so it will be created inside the container (not the volume) by n8n.Could you delete your container and make sure to pull latest before trying again with docker pull docker.n8n.io/n8nio/n8n?
Could you also let us know what OS you’re on, and can you give this a shot without volume mapping (just in case that’s the issue)?