libcontainer: add support for Landlock #7231

Job	Run time
cross-i386	23s
test (ubuntu-20.04, 1.22.x, rootless, -race)	24s
test (ubuntu-20.04, 1.22.x, rootless)	22s
test (ubuntu-20.04, 1.22.x, -race)	24s
test (ubuntu-20.04, 1.22.x)	28s
test (ubuntu-20.04, 1.23.x, rootless, -race)	26s
test (ubuntu-20.04, 1.23.x, rootless)	25s
test (ubuntu-20.04, 1.23.x, -race)	24s
test (ubuntu-20.04, 1.23.x)	31s
test (ubuntu-20.04, 1.23.x, criu-dev)	1m 2s
test (ubuntu-24.04, 1.22.x, rootless, -race)	1m 39s
test (ubuntu-24.04, 1.22.x, rootless)	35s
test (ubuntu-24.04, 1.22.x, -race)	39s
test (ubuntu-24.04, 1.22.x)	1m 37s
test (ubuntu-24.04, 1.23.x, rootless, -race)	1m 30s
test (ubuntu-24.04, 1.23.x, rootless)	34s
test (ubuntu-24.04, 1.23.x, -race)	37s
test (ubuntu-24.04, 1.23.x)	37s
test (ubuntu-24.04, 1.23.x, criu-dev)	1m 1s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	34s
test (actuated-arm64-6cpu-8gb, 1.23.x)	32s
all-done	0s
	14m 44s

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