runc exec: implement CPU affinity #7289

Job	Run time
cross-i386	54s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 20s
test (ubuntu-20.04, 1.22.x, rootless)	7m 9s
test (ubuntu-20.04, 1.22.x, -race)	4m 38s
test (ubuntu-20.04, 1.22.x)	3m 55s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 19s
test (ubuntu-20.04, 1.23.x, rootless)	6m 57s
test (ubuntu-20.04, 1.23.x, -race)	4m 49s
test (ubuntu-20.04, 1.23.x)	4m 2s
test (ubuntu-20.04, 1.23.x, criu-dev)	4m 47s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 38s
test (ubuntu-24.04, 1.22.x, rootless)	9m 36s
test (ubuntu-24.04, 1.22.x, -race)	7m 38s
test (ubuntu-24.04, 1.22.x)	6m 49s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 10s
test (ubuntu-24.04, 1.23.x, rootless)	9m 43s
test (ubuntu-24.04, 1.23.x, -race)	8m 8s
test (ubuntu-24.04, 1.23.x)	7m 13s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 58s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 39s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 54s
all-done	0s
	2h 28m 16s

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