libcontainer: add support for Landlock #7232

Job	Run time
cross-i386	58s
test (ubuntu-20.04, 1.22.x, rootless, -race)	45s
test (ubuntu-20.04, 1.22.x, rootless)	44s
test (ubuntu-20.04, 1.22.x, -race)	50s
test (ubuntu-20.04, 1.22.x)	50s
test (ubuntu-20.04, 1.23.x, rootless, -race)	42s
test (ubuntu-20.04, 1.23.x, rootless)	45s
test (ubuntu-20.04, 1.23.x, -race)	44s
test (ubuntu-20.04, 1.23.x)	42s
test (ubuntu-20.04, 1.23.x, criu-dev)	1m 18s
test (ubuntu-24.04, 1.22.x, rootless, -race)	47s
test (ubuntu-24.04, 1.22.x, rootless)	1m 22s
test (ubuntu-24.04, 1.22.x, -race)	49s
test (ubuntu-24.04, 1.22.x)	1m 30s
test (ubuntu-24.04, 1.23.x, rootless, -race)	1m 3s
test (ubuntu-24.04, 1.23.x, rootless)	2m 0s
test (ubuntu-24.04, 1.23.x, -race)	49s
test (ubuntu-24.04, 1.23.x)	50s
test (ubuntu-24.04, 1.23.x, criu-dev)	1m 16s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	46s
test (actuated-arm64-6cpu-8gb, 1.23.x)	45s
all-done	0s
	20m 15s

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