scripts: add backporting script #4476
Merged
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This adds a simple script for backporting pull requests to older
branches. It accepts as parameters a list of pull request numbers which
whose commits are to be cherry-picked. The identification of PRs
currently happens by using the commit message of the merge of the PR,
which should conform to the message "Merge pull request #".
While the heuristic works in practice, we could instead also use the
direct references from GitHub via "pull/#/head". This requires the
user to have all these references fetched, though, so we can just use
the current heuristic until we experience any issues with that.
Dunno if we want this. I've used this script to create #4475, and I think a bit of automation is nice to have.