get back to ci-unified container #342

Job	Run time
preflight / preflight	8s
preflight / ci-versions	1m 3s
test-linux-stable-int	17m 33s
test-linux-stable-runtime-benchmarks	31m 40s
test-linux-stable-no-try-runtime (1/2)	42m 40s
test-linux-stable-no-try-runtime (2/2)	29m 55s
test-linux-stable (1/3, parity-large)	40m 41s
test-linux-stable (1/3, parity-oldlinux)	1s
test-linux-stable (2/3, parity-large)	29m 32s
test-linux-stable (2/3, parity-oldlinux)	1s
test-linux-stable (3/3, parity-large)	28m 6s
test-linux-stable (3/3, parity-oldlinux)	1s
All tests passed	1s
	3h 41m 22s

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