libct/int: add exec benchmark #6788

Job	Run time
cross-i386	1m 0s
cross-i386 (runc_nodmz)	53s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 20s
test (ubuntu-20.04, 1.22.x, rootless)	7m 2s
test (ubuntu-20.04, 1.22.x, -race)	8m 26s
test (ubuntu-20.04, 1.22.x)	6m 31s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 31s
test (ubuntu-20.04, 1.23.x, rootless)	7m 19s
test (ubuntu-20.04, 1.23.x, -race)	7m 47s
test (ubuntu-20.04, 1.23.x)	6m 53s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 25s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 42s
test (ubuntu-24.04, 1.22.x, rootless)	9m 32s
test (ubuntu-24.04, 1.22.x, -race)	8m 11s
test (ubuntu-24.04, 1.22.x)	7m 15s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 53s
test (ubuntu-24.04, 1.23.x, rootless)	8m 56s
test (ubuntu-24.04, 1.23.x, -race)	7m 28s
test (ubuntu-24.04, 1.23.x)	6m 46s
test (ubuntu-24.04, 1.23.x, runc_nodmz)	6m 34s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 10s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	12m 11s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 41s
all-done	1s
	2h 50m 27s

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