Re: CI and test improvements

rebased on b6a5158f9 and 054325c5e

Also, cirrus/freebsd task can run 3x faster with more CPUs.
Subject: [PATCH 21/21] cirrus: run freebsd with more CPUs+RAM
                                                                                          
 
https://cirrus-ci.com/task/4664440120410112
https://cirrus-ci.com/task/5100411110555648

In the past, I gather there was some undiagnosed issue when using more CPUs
(cirrus now enforces >5GB RAM when using 6 CPUs - maybe you tried to use too
little RAM, or maybe hit bad performance involving NUMA?)

https://www.postgresql.org/message-id/flat/20220310033347.hgxk4pyarzq4hxwp@alap3.anarazel.de#f36c0b17e33e31e7925e7e5812998686