RELEASES: add formal release policy for runc #7141

Job	Run time
cross-i386	1m 18s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 18s
test (ubuntu-20.04, 1.22.x, rootless)	6m 52s
test (ubuntu-20.04, 1.22.x, -race)	8m 3s
test (ubuntu-20.04, 1.22.x)	7m 4s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 29s
test (ubuntu-20.04, 1.23.x, rootless)	7m 2s
test (ubuntu-20.04, 1.23.x, -race)	7m 55s
test (ubuntu-20.04, 1.23.x)	7m 17s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 37s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 37s
test (ubuntu-24.04, 1.22.x, rootless)	9m 27s
test (ubuntu-24.04, 1.22.x, -race)	8m 1s
test (ubuntu-24.04, 1.22.x)	7m 9s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 59s
test (ubuntu-24.04, 1.23.x, rootless)	9m 47s
test (ubuntu-24.04, 1.23.x, -race)	8m 1s
test (ubuntu-24.04, 1.23.x)	7m 16s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 3s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 47s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 25s
all-done	1s
	2h 45m 28s

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