RELEASES: add formal release policy for runc #7142

Job	Run time
cross-i386	1m 12s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 28s
test (ubuntu-20.04, 1.22.x, rootless)	6m 52s
test (ubuntu-20.04, 1.22.x, -race)	7m 58s
test (ubuntu-20.04, 1.22.x)	7m 15s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 22s
test (ubuntu-20.04, 1.23.x, rootless)	7m 14s
test (ubuntu-20.04, 1.23.x, -race)	8m 8s
test (ubuntu-20.04, 1.23.x)	7m 2s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 48s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 52s
test (ubuntu-24.04, 1.22.x, rootless)	9m 16s
test (ubuntu-24.04, 1.22.x, -race)	7m 57s
test (ubuntu-24.04, 1.22.x)	7m 7s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 2s
test (ubuntu-24.04, 1.23.x, rootless)	9m 45s
test (ubuntu-24.04, 1.23.x, -race)	8m 6s
test (ubuntu-24.04, 1.23.x)	7m 13s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 5s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 48s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 21s
all-done	1s
	2h 45m 52s

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