Demo: fix b2drop

demo/deployments/hub.yaml

@@ -38,6 +38,8 @@ singleuser:
     extraVolumeMounts:
       - name: cvmfs-host
         mountPath: "/cvmfs:shared"
+      - name: b2drop
+        mountPath: '/mnt/b2drop:shared'
   lifecycleHooks:
     postStart:
       exec: { "command": ["/bin/sh", "-c", "ln -snf /mnt/b2drop $HOME/b2drop; ln -snf /cvmfs $HOME/cvmfs; mkdir -p /home/jovyan/.notebookCheckpoints"] }