Extended container support #1770

Job	Run time
deploy	36s
test (3.8, lint)	48s
test (3.8, lint_docs)	1m 25s
test (3.8, mypy)	48s
test (3.8, unit-quick)	15m 40s
test (3.8, unit-diagnostic-servebasic-gx-dev)	5m 15s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2109)	22m 13s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2205)	24m 52s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-dev)	28m 55s
test (3.8, unit-nonredundant-noclientbuild-noshed-nogx)	51m 52s
test (3.8, unit-diagnostic-serveclientcmd)	15m 7s
test (3.11, lint)	46s
test (3.11, mypy)	43s
test (3.11, unit-quick)	15m 52s
	3h 4m 52s

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