gvisor-containerd-shim is not compatible with containerd 1.1 or earlier.
Starting from containerd 1.2, shim v2 is the preferred interface.
PiperOrigin-RevId: 351485556
This formalizes the adhoc scripts previously in kokoro. The image targets can
be used by e.g. benchmarks in order to automated image prepation.
PiperOrigin-RevId: 290982744