score: add check for PodDisruptionBudget with no policy

[kd7lxl]

This adds check for PodDisruptionBudget with no policy. PDBs should specify a policy with minAvailable or maxUnavailable. This test flags PDBs that don't specify either.

This is based on the assumption that the PDB is invalid without minAvailable or maxUnavailable defined -- do you know of any cases where it's valid to not specify either? I don't. When I've tested a PDB like this in k8s (by accident 😄), the controller sets .status.expectedPods: 0 regardless of the deployment replicas field.

RELNOTE: Add check for PodDisruptionBudget with no policy

[zegl]

This is really cool, thanks a lot!

bors merge

[bors]

Build succeeded:

• ci/circleci: test