do not merge: block release-please PR for "api: foo" until "api: foo" issue with "release blocking" is closed

[noahdietz]

It would be really cool if do not merge bot automatically added the do not merge label to the release-please PR labeled with api: foo when there is at least one open issue also labeled for api: foo that has the release blocking label. When all issues with release blocking for api: foo are resolved/the labels removed, do not merge bot would remove the do not merge label.

A real use case I'm dealing with is that I had to temporarily skip a test for a specific module, with the owner's permission, to get a massive PR merged, with the understanding that the owner would fix the tests and close the tracking issues before the next release. However, this is too easily forgotten/doesn't work in large teams, so using automation to warn other maintainers of open blockers would be really useful.

[parthea]

It could be helpful to have a prefix do-not-merge: for labels that are intended to be consumed by the do-not-merge bot https://github.com/googleapis/repo-automation-bots/tree/main/packages/do-not-merge

[noahdietz]

Good idea Tony.

Another idea I had is if the repo is a monorepo with multiple releases, do not merge would want to look at the api: foo labels, but if it was a repo with only one release, then the api: foo labels wouldn't be necessary - for example, I would use this on the Go GAPIC generator, which of course is not an API.