wip: Use cert-manager for cnpg's auth

apps/cert-manager.yaml

@@ -41,3 +41,10 @@ spec:
     - http01:
         ingress:
           ingressClassName: cilium
+---
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: selfsigned
+spec:
+  selfSigned: {}