Add kops discovery server to kustomization

Follow-up of:
  - kubernetes#9149

Signed-off-by: Arnaud Meukam <ameukam@gmail.com>

Author: ameukam

kubernetes/apps/kustomization.yaml

@@ -6,6 +6,7 @@ resources:
   - datadog.yaml
   - external-secrets.yaml
   - cert-manager.yaml
+  - kops-discovery.yaml
   - kube-system.yaml
   - kyverno.yaml
   - prow.yaml