Allow mr checkout to pick a different source branch

[maxice8]

Describe the feature or problem you'd like to solve

When backporting patches for Alpine Linux I like to checkout from branches other than the one that is default on the remote

Propose a Solution

add a --source branch that glab switches to before checking out the merge request

[profclems]

So the --source branch specified will be tracking that of the remote and rebased?

[maxice8]

It will be the branch in which the changes will be applied on top of.

[clemsbot]

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