command to know in which release branch(es) a specific commit is

[targos]

I don't think we have a simple automated way to do that now. Due to the way we land commits in releases, we cannot just search for the commit SHA in release branches. I think it would be useful to have a command for that.

Prior art in V8: https://github.com/v8/v8/blob/master/tools/release/mergeinfo.py

[targos]

Example:

PR: https://github.com/nodejs/node/pull/30123 Landed on master in https://github.com/nodejs/node/commit/511f67bcb42b59c9a3a3efab8fed578db100afe1 Landed on v13.x in https://github.com/nodejs/node/commit/d549a34597d8d9f8489de748e42eefdd148d0bef Landed on v12.x in https://github.com/nodejs/node/commit/375f349760d141b37abe5e7119aab243426eb2f4 Did not land on v10.x or v8.x

[github-actions[bot]]

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