Allow to merge to a specific target branch instead of main

[ryx2]

End-user friendly description of the problem this fixes or functionality that this introduces

• [ ] Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

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Give a summary of what the PR does, explaining any non-trivial design decisions

I usually develop onto my 'feature' branch, but there is no option to merge into the feature branch instead of the default branch

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Link of any specific issues this addresses