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Create a runbook for switching CI master
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As a follow up to T224591: Migrate contint* hosts to Buster, we need a runbook explaining how to switch the CI masters.

Runbook to be at

Once written, it should be linked at:

Event Timeline

Literally extract the information from T224591

The runbook address the issues we had with uid/gid changing during the transfer which then require painful chmod all over the place. The reason is the quickdata copy puppet classes that spawns rsync within a chroot which in turns prevent uid/gid mapping.

Tyler bootstrapped and I have edited it with the basic skeleton of how to do a switch over. The biggest devils are: