Salsa-CI: Refactor jobs to use templates and extend with a couple new tests
See commit messages for details.
The failure after commit "Salsa-CI: Add new default-mysql-server and zoph upgrade scenario" is intentional, the upgrade scenario is indeed broken and tracked in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035949.
Feedback welcome!
Edited by Otto Kekäläinen