RELEASES: add formal release policy for runc #7143

Job	Run time
cross-i386	1m 11s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 38s
test (ubuntu-20.04, 1.22.x, rootless)	6m 49s
test (ubuntu-20.04, 1.22.x, -race)	7m 58s
test (ubuntu-20.04, 1.22.x)	7m 5s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 36s
test (ubuntu-20.04, 1.23.x, rootless)	7m 45s
test (ubuntu-20.04, 1.23.x, -race)	8m 7s
test (ubuntu-20.04, 1.23.x)	7m 8s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 36s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 58s
test (ubuntu-24.04, 1.22.x, rootless)	9m 22s
test (ubuntu-24.04, 1.22.x, -race)	8m 15s
test (ubuntu-24.04, 1.22.x)	7m 19s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 12s
test (ubuntu-24.04, 1.23.x, rootless)	9m 42s
test (ubuntu-24.04, 1.23.x, -race)	8m 4s
test (ubuntu-24.04, 1.23.x)	7m 26s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 2s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 49s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 24s
all-done	1s
	2h 48m 27s

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