Include and review kube-score

[danielepolencic]

From kube-score readme:

• Container limits (should be set)
• Pod is targeted by a NetworkPolicy, both egress and ingress rules are recommended
• Deployments and StatefulSets should have a PodDisruptionPolicy
• Deployments and StatefulSets should have host PodAntiAffinity configured
• Container probes, both readiness and liveness checks should be configured, and should not be identical
• Container securityContext, run as high number user/group, do not run as root or with privileged root fs
• Stable APIs, use a stable API if available (supported: Deployments, StatefulSets, DaemonSet)

More: https://github.com/zegl/kube-score/blob/master/README_CHECKS.md