Improved the guide on how to avoid permission errors

docker-compose.yml

@@ -34,3 +34,7 @@ services:
       - ./static/:/var/lib/akkoma/static/:Z
       - ./uploads/:/var/lib/akkoma/uploads/:Z
       - ./etc/:/etc/akkoma/:Z
+## Enable the following volume if you are running Docker in emulated
+## environments and getting permission errors
+# volumes:
+#   docker-db: