chore(add-ons): Add network policies to operators and monitoring

add-ons/cnpg/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - networkpolicy.yaml

add-ons/cnpg/networkpolicy.yaml

@@ -0,0 +1,41 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: cnpg
+  namespace: cnpg-system
+spec:
+  egress:
+    - ports:
+        - port: 53
+          protocol: UDP
+        - port: 53
+          protocol: TCP
+      to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+          podSelector:
+            matchLabels:
+              k8s-app: kube-dns
+    - ports:
+        - port: 6443
+          protocol: TCP
+    - ports:
+        - port: 8000
+          protocol: TCP
+      to:
+        - namespaceSelector: {}
+          podSelector:
+            matchExpressions:
+              - key: cnpg.io/cluster
+                operator: Exists
+  ingress:
+    - ports:
+        - port: 9443
+          protocol: TCP
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: cloudnative-pg
+  policyTypes:
+    - Ingress
+    - Egress