rebase locally and bulk push as a background task (?)

[dodgog]

Currently, when rebasing a long stack, the process is bottlenecked on network speed -- each branch has to get pushed in order. I'm wondering if it is possible to do local rebases first and then push all branches together. Potentially compressed, or as a background task.

[TarasMazepa]

Thank you for the suggestion! I have created an issue earlier which covers that use case #792