Extended container support #1627

Job	Run time
deploy	40s
test (3.7, lint)	49s
test (3.7, lint_docs)	2m 13s
test (3.7, mypy)	1m 0s
test (3.7, unit-quick)	23m 23s
test (3.7, unit-diagnostic-servebasic-gx-dev)	6m 36s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2105)	29m 46s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2109)	39m 25s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-dev)	34m 53s
test (3.7, unit-nonredundant-noclientbuild-noshed-nogx)	1h 16m 39s
test (3.7, unit-diagnostic-serveclientcmd)	20m 38s
test (3.11, lint)	53s
test (3.11, mypy)	48s
test (3.11, unit-quick)	21m 45s
	4h 19m 28s

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