[llvm] [GitHub] Add workflows to manage merging of PRs from authors without commit access (PR #124910)

[David Spickett via llvm-commits]

DavidSpickett wrote:

>     (optional) Author comments "ready to merge" -> sets `ready-to-merge`

Slight problem here where you comment then the label is added. Then you later update the branch which removes the label but the next time we look at the PR, the original comment is there and we'd then put back the label. Despite their being no "new" ready to merge comment.

In theory we could automate the removal of that comment. Or we could use a new comment from the bot as the boundary below which are possible "new" ready to merge comments. Would get rather spammy if you update the branch a lot post approval, so maybe there are better ways.

https://github.com/llvm/llvm-project/pull/124910