cfbot failures

On 2023-02-11, Andres Freund wrote 20230212004254.3lp22a7bpkcjo3y6@awork3.anarazel.de:
> The windows test failure is a transient issue independent of the patch
> (something went wrong with image permissions).

That's happening again since 3h ago.
https://cirrus-ci.com/github/postgresql-cfbot/postgresql

I suggested in the past that cfbot should delay if (say) the last 5 or
10 consecutive runs all failed (or maybe all failed on the same "task").

Maybe that should only apply to re-tests but not to new patches.  It
could inject 15min delays until the condition is resolved.  Or it could
run retests on a longer interval like 96h instead of 24.  And add a
warning or start beeping about the issue.

That would mitigate not only issues in the master branch but also issues
with CI infrastructure (cirrus/google/images).

-- 
Justin