RFC: Use GH-labels to flag a PR that has [noissue] or multiple commits

[mdellweg]

The idea is that the PR CI can set (clear) labels about the state of the commits.

• noissue in case, any commit message contains [noissue] - reviewers should take extra care if those commits are suitable for not having an issue
• multi-commit in case the PR contains more than one commit - reviewers should judge if the changes suitable to be split into seperate commits, and occasionally request to split the PR or merge the commits

Simple PR's would not have these labels.

[quba42]

I personally like the idea/approach, and I also have a possible extension for it:

Automatically add a .feature, .bugfix, etc. labels for PRs that do have a changelog entry. I recently missed during review that a PR was using .misc instead of .bugfix, which can be pretty annoying if the change needs to be cherry-picked later. (I think a correct changelog categorization is fairly important!)

[stale]

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