RELEASES: add formal release policy for runc #7140

Job	Run time
cross-i386	1m 26s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 16s
test (ubuntu-20.04, 1.22.x, rootless)	6m 43s
test (ubuntu-20.04, 1.22.x, -race)	7m 52s
test (ubuntu-20.04, 1.22.x)	7m 15s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 36s
test (ubuntu-20.04, 1.23.x, rootless)	7m 17s
test (ubuntu-20.04, 1.23.x, -race)	8m 13s
test (ubuntu-20.04, 1.23.x)	7m 1s
test (ubuntu-20.04, 1.23.x, criu-dev)	8m 31s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 17s
test (ubuntu-24.04, 1.22.x, rootless)	9m 30s
test (ubuntu-24.04, 1.22.x, -race)	8m 5s
test (ubuntu-24.04, 1.22.x)	7m 11s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 51s
test (ubuntu-24.04, 1.23.x, rootless)	9m 43s
test (ubuntu-24.04, 1.23.x, -race)	8m 12s
test (ubuntu-24.04, 1.23.x)	8m 58s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 9s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 51s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 12s
all-done	1s
	2h 49m 10s

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