runc exec: implement CPU affinity #7286

Job	Run time
cross-i386	48s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 35s
test (ubuntu-20.04, 1.22.x, rootless)	7m 15s
test (ubuntu-20.04, 1.22.x, -race)	5m 24s
test (ubuntu-20.04, 1.22.x)	4m 18s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 50s
test (ubuntu-20.04, 1.23.x, rootless)	7m 25s
test (ubuntu-20.04, 1.23.x, -race)	5m 5s
test (ubuntu-20.04, 1.23.x)	4m 16s
test (ubuntu-20.04, 1.23.x, criu-dev)	5m 8s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 44s
test (ubuntu-24.04, 1.22.x, rootless)	9m 26s
test (ubuntu-24.04, 1.22.x, -race)	7m 27s
test (ubuntu-24.04, 1.22.x)	8m 18s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 5s
test (ubuntu-24.04, 1.23.x, rootless)	9m 38s
test (ubuntu-24.04, 1.23.x, -race)	8m 10s
test (ubuntu-24.04, 1.23.x)	7m 26s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 51s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 40s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 57s
all-done	0s
	2h 32m 46s

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