Async PV for workspace: API between client/server

[benoitf]

API between client/server

as part of #15384 there is a need to have the 'rsync' pod included in the workspace POD to 'discuss' with the data sync pod.

Describe the solution you'd like

It will consist of asking if there is something to restore or not for a given workspaceID.

And then, if there is data to restore, choose a way to do the transfer of file and grab information (like using rsync or something else, etc)

Both rsync client and rssync server need to agree on this

note:

Idea of the 'restore' mechanism could be used as well to import files from a local env (like someone connected to internet with its laptop) to a Che Workspace.

In that case, we could import files from laptop, edit from Che workspace and all changes are kept on the 'user/laptop storage'.

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