Extended container support #1628

Job	Run time
deploy	42s
test (3.7, lint)	1m 7s
test (3.7, lint_docs)	1m 57s
test (3.7, mypy)	59s
test (3.7, unit-quick)	16m 36s
test (3.7, unit-diagnostic-servebasic-gx-dev)	7m 55s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2105)	28m 14s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2109)	27m 16s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-dev)	34m 35s
test (3.7, unit-nonredundant-noclientbuild-noshed-nogx)	1h 12m 33s
test (3.7, unit-diagnostic-serveclientcmd)	18m 7s
test (3.11, lint)	1m 1s
test (3.11, mypy)	49s
test (3.11, unit-quick)	17m 54s
	3h 49m 45s

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