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CONTRIBUTING.md: document using labels for backporting

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Arnout Engelen 2022-05-28 12:58:40 +02:00
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@ -97,6 +97,12 @@ git push origin $(git branch --show-current) --force-with-lease
Follow these steps to backport a change into a release branch in compliance with the [commit policy](https://nixos.org/nixpkgs/manual/#submitting-changes-stable-release-branches).
You can add a label such as `backport release-22.05` to a PR, so that merging it will
automatically create a backport (via [a GitHub Action](.github/workflows/backport.yml)).
This also works for PR's that have already been merged, and might take a couple of minutes to trigger.
You can also create the backport manually:
1. Take note of the commits in which the change was introduced into `master` branch.
2. Check out the target _release branch_, e.g. `release-21.11`. Do not use a _channel branch_ like `nixos-21.11` or `nixpkgs-21.11-darwin`.
3. Create a branch for your change, e.g. `git checkout -b backport`.