[playground] Mount the shared file system between notebook pod and worker pods in ACK cluster.

[lidongze0629]

Is your feature request related to a problem? Please describe.

We currently serve the jupyterlab server inside a docker container, user-uploaded files cannot be visible for worker pods. Users cannot provide their own data files to load a graph.

By running the notebook server as a pod and sharing a volume between the notebook pod and graphscope worker pods, the user-uploaded files can be used to load graph, etc.

We could also provide the pre-provided dataset via a read-only volume as well.

Additional context

This is for making playground better. Along with this issue we also need to test if the volumes arguments works when user feeds a cloud volume in.

TODO

• Migrate jupyterhub and the notebook server into kubernetes cluster.
• Mount a shared FS on ACK cluster (maybe Aliyun NAS)

[sighingnow]

It should be a volume rather than shared file system.

It feature is not limited to playground, but more boardly, we need to check if our session(volumes=...) support such kind of mount.