runc exec: implement CPU affinity #7321

Job	Run time
cross-i386	3m 57s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 34s
test (ubuntu-20.04, 1.22.x, rootless)	7m 15s
test (ubuntu-20.04, 1.22.x, -race)	8m 10s
test (ubuntu-20.04, 1.22.x)	7m 45s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 39s
test (ubuntu-20.04, 1.23.x, rootless)	7m 31s
test (ubuntu-20.04, 1.23.x, -race)	8m 17s
test (ubuntu-20.04, 1.23.x)	7m 32s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 52s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 1s
test (ubuntu-24.04, 1.22.x, rootless)	9m 43s
test (ubuntu-24.04, 1.22.x, -race)	9m 36s
test (ubuntu-24.04, 1.22.x)	7m 17s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 50s
test (ubuntu-24.04, 1.23.x, rootless)	11m 10s
test (ubuntu-24.04, 1.23.x, -race)	7m 54s
test (ubuntu-24.04, 1.23.x)	8m 30s
test (ubuntu-24.04, 1.23.x, criu-dev)	9m 6s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 58s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 31s
all-done	0s
	2h 57m 8s

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