libcontainer: add support for Landlock #7228

Job	Run time
cross-i386	23s
test (ubuntu-20.04, 1.22.x, rootless, -race)	27s
test (ubuntu-20.04, 1.22.x, rootless)	28s
test (ubuntu-20.04, 1.22.x, -race)	25s
test (ubuntu-20.04, 1.22.x)	30s
test (ubuntu-20.04, 1.23.x, rootless, -race)	25s
test (ubuntu-20.04, 1.23.x, rootless)	26s
test (ubuntu-20.04, 1.23.x, -race)	25s
test (ubuntu-20.04, 1.23.x)	29s
test (ubuntu-20.04, 1.23.x, criu-dev)	1m 2s
test (ubuntu-24.04, 1.22.x, rootless, -race)	38s
test (ubuntu-24.04, 1.22.x, rootless)	34s
test (ubuntu-24.04, 1.22.x, -race)	32s
test (ubuntu-24.04, 1.22.x)	1m 31s
test (ubuntu-24.04, 1.23.x, rootless, -race)	42s
test (ubuntu-24.04, 1.23.x, rootless)	36s
test (ubuntu-24.04, 1.23.x, -race)	40s
test (ubuntu-24.04, 1.23.x)	39s
test (ubuntu-24.04, 1.23.x, criu-dev)	2m 7s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	36s
test (actuated-arm64-6cpu-8gb, 1.23.x)	34s
all-done	0s
	14m 9s

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