[llvm] [GitHub][workflows] Add buildbot information comment to first merged PR from a new contributor (PR #78292)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Thanks for your feedback, this is exactly what I was looking for!

> So I wouldn't say this is a rare occurrence, it seems to be the common case.

Yeah my bias comes in here seeing builds go by all the time that do work properly, I forget the important bit is the builds the specific committer sees. So your take away isn't wrong at all. Unfortunate, but not a failure on the part of committers, instead a sign that the system should be improved.

> So I wouldn't say this is a rare occurrence, it seems to be the common case. My conclusion is that I should just entirely ignore these emails... that's probably not right either though, but I am not sure how I could even figure out whether I need to take any action.

We're asking a lot of folks to understand a whole other system, and explaining how to diagnose problems generally is too much to include here and something I wouldn't want folks to think they've got to spend too much time on.

Your feedback certainly backs up Alex's suggestions so I will add those now.

https://github.com/llvm/llvm-project/pull/78292