ability to backport a PR to any repo, not necessarily a fork

[mvayngrib]

Is your feature request related to a problem? Please describe.

forks get detached for one reason or another, but backporting between repos can still be useful

Describe the solution you'd like

a github repo option, e.g. target_repo(s), to specify to which repo to send the backport PR

Describe alternatives you've considered
not sure what the alternatives would be 😅

[korthout]

That is a great idea! Thanks for raising it @mvayngrib 🙌

The target_repo input would take something in the form of owner/repo defaulting to the current repo on which the action is run.

This feature would require changing the following:

• add an extra remote for the target repo, i.e. target remote
• git fetch of target branch from target remote
• git push of backport branch to target remote
• create pull request on target repo
• label pull request on target repo

[mvayngrib]

i was thinking about it and it might make more sense to support a field targets of the format owner1/repo1/branch1,owner2/repo2/branch2 to avoid getting confused with combinations of target_repo and target_branches

alternatively, we add support via labels first (maybe via named capturing groups?), and see if anyone else cares about this, then add targets later

[korthout]

Resolved by #405 and released in v3.0.0.