Hey, kubeval looks really useful. We're adding it to our heptapod/gitlab CI. It's as simple as

kubeval:
  image: garethr/kubeval
  script:
    - kubeval --directories .

We use kustomize https://kustomize.io/ so we have a bunch of kustomization.yaml which fail the test. Since we also store the resulting generated files in our repos, we'd like to be able to run kubeval --directories . --exclude kustomization.yaml