join the cgroup after the initial setup finished #6691

Job	Run time
cross-i386	1m 10s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 13s
cross-i386 (runc_nodmz)	1m 17s
test (ubuntu-20.04, 1.22.x, rootless)	7m 2s
test (ubuntu-20.04, 1.22.x, -race)	8m 1s
test (ubuntu-20.04, 1.22.x)	7m 9s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 10s
test (ubuntu-20.04, 1.23.x, rootless)	6m 55s
test (ubuntu-20.04, 1.23.x, -race)	7m 58s
test (ubuntu-20.04, 1.23.x)	7m 14s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 48s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 2s
test (ubuntu-24.04, 1.22.x, rootless)	9m 26s
test (ubuntu-24.04, 1.22.x, -race)	8m 5s
test (ubuntu-24.04, 1.22.x)	7m 51s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 26s
test (ubuntu-24.04, 1.23.x, rootless)	9m 27s
test (ubuntu-24.04, 1.23.x, -race)	8m 23s
test (ubuntu-24.04, 1.23.x)	6m 55s
test (ubuntu-24.04, 1.23.x, runc_nodmz)	6m 58s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 38s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 48s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 41s
all-done	1s
	2h 54m 38s

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