runc exec: implement CPU affinity #7301

Job	Run time
cross-i386	1m 14s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 19s
test (ubuntu-20.04, 1.22.x, rootless)	7m 26s
test (ubuntu-20.04, 1.22.x, -race)	7m 36s
test (ubuntu-20.04, 1.22.x)	7m 12s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 23s
test (ubuntu-20.04, 1.23.x, rootless)	7m 11s
test (ubuntu-20.04, 1.23.x, -race)	7m 54s
test (ubuntu-20.04, 1.23.x)	7m 37s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 44s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 50s
test (ubuntu-24.04, 1.22.x, rootless)	9m 35s
test (ubuntu-24.04, 1.22.x, -race)	7m 43s
test (ubuntu-24.04, 1.22.x)	6m 52s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 45s
test (ubuntu-24.04, 1.23.x, rootless)	9m 41s
test (ubuntu-24.04, 1.23.x, -race)	8m 0s
test (ubuntu-24.04, 1.23.x)	7m 26s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 44s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 46s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 58s
all-done	1s
	2h 44m 57s

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