libcontainer: add support for Landlock #7230

Job	Run time
cross-i386	41s
test (ubuntu-20.04, 1.22.x, rootless, -race)	34s
test (ubuntu-20.04, 1.22.x, rootless)	24s
test (ubuntu-20.04, 1.22.x, -race)	26s
test (ubuntu-20.04, 1.22.x)	30s
test (ubuntu-20.04, 1.23.x, rootless, -race)	27s
test (ubuntu-20.04, 1.23.x, rootless)	31s
test (ubuntu-20.04, 1.23.x, -race)	30s
test (ubuntu-20.04, 1.23.x)	30s
test (ubuntu-20.04, 1.23.x, criu-dev)	1m 0s
test (ubuntu-24.04, 1.22.x, rootless, -race)	1m 48s
test (ubuntu-24.04, 1.22.x, rootless)	38s
test (ubuntu-24.04, 1.22.x, -race)	40s
test (ubuntu-24.04, 1.22.x)	35s
test (ubuntu-24.04, 1.23.x, rootless, -race)	33s
test (ubuntu-24.04, 1.23.x, rootless)	32s
test (ubuntu-24.04, 1.23.x, -race)	32s
test (ubuntu-24.04, 1.23.x)	33s
test (ubuntu-24.04, 1.23.x, criu-dev)	1m 1s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	36s
test (actuated-arm64-6cpu-8gb, 1.23.x)	32s
all-done	0s
	13m 33s

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