Fix ocis: replace Docker NFS volume with systemd automount bind mount

Same pattern as calibre fix — Docker NFS named volumes with soft mount
fail when unRAID drives spin down. Use systemd NFS automount at
/mnt/nas_owncloud instead; hard mount blocks on spin-up rather than EIO.

ocis/docker-compose.yml

@@ -26,17 +26,13 @@ services:
       - PROXY_CSP_CONFIG_FILE_LOCATION=/etc/ocis/csp.yaml
     volumes:
       - /srv/ocis/data:/var/lib/ocis
-      - nas_owncloud:/var/lib/ocis/storage/users
+      - /mnt/nas_owncloud:/var/lib/ocis/storage/users
       - /srv/ocis/config:/etc/ocis
     ports:
       - 9200:9200
     networks:
       - npm-network
 
-volumes:
-  nas_owncloud:
-    external: true
-
 networks:
   npm-network:
     external: true