Tests

Add a dedicated manual maintenance mode flag #1783

Job	Run time
Test docker image	3m 35s
Inspect test runner output in the context of a Github Workflow	25s
Run test suite (ubuntu-20.04, 3.8)	4m 13s
check	24s
Run test suite (ubuntu-20.04, 3.9)	3m 53s
Test we can build PyPI package	51s
Run test suite (ubuntu-20.04, 3.10)	3m 57s
Run test suite (ubuntu-22.04, 3.8)	3m 59s
Run test suite (ubuntu-22.04, 3.9)	4m 9s
Run test suite (ubuntu-22.04, 3.10)	3m 52s
Run test suite (windows-2019, 3.8)	1m 43s
Run test suite (windows-2019, 3.9)	2m 7s
Run test suite (windows-2019, 3.10)	1m 52s
Run test suite (macos-14, 3.8)	1m 20s
Run test suite (macos-14, 3.9)	56s
Run test suite (macos-14, 3.10)	1m 0s
required-checks	1s
	38m 17s

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