RELEASES: add formal release policy for runc #7126

Job	Run time
cross-i386	1m 12s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 25s
test (ubuntu-20.04, 1.22.x, rootless)	6m 45s
test (ubuntu-20.04, 1.22.x, -race)	7m 48s
test (ubuntu-20.04, 1.22.x)	7m 7s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 17s
test (ubuntu-20.04, 1.23.x, rootless)	7m 1s
test (ubuntu-20.04, 1.23.x, -race)	8m 14s
test (ubuntu-20.04, 1.23.x)	7m 1s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 41s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 2s
test (ubuntu-24.04, 1.22.x, rootless)	9m 36s
test (ubuntu-24.04, 1.22.x, -race)	7m 55s
test (ubuntu-24.04, 1.22.x)	7m 10s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 52s
test (ubuntu-24.04, 1.23.x, rootless)	9m 43s
test (ubuntu-24.04, 1.23.x, -race)	8m 11s
test (ubuntu-24.04, 1.23.x)	7m 17s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 47s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 40s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 11s
all-done	1s
	2h 44m 56s

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