The test [k8s.io] Probing container [It] should not be restarted with a
/healthz http liveness probe [NodeConformance] [Conformance]
fails because it's using a nginx image that's spawns a server that's
only listening on IPv4 by default.

Switching to an image like TestWebserver that's listening in IPv4 and IPv6 by default
allows the test to run on IPv4 and IPv6 environments.

Reference: https://github.com/kubernetes/kubernetes/issues/70248