[Provisioner][Docker] Considering replace `docker` with `sudo docker` to avoid permission issue.

[cblmemo]

Originally posted https://github.com/skypilot-org/skypilot/pull/4115#discussion_r1805919972

We should consider replacing docker with sudo docker to avoid any permission issue. Current method: manually add users to docker group.

[Michaelvll]

Originally posted #4115 (comment)

We should consider replacing docker with sudo docker to avoid any permission issue. Current method: manually add users to docker group.

This is just a question, not sure which one is better : )

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