example: add network policy for recovery backend

Longhorn 4675

Signed-off-by: Derek Su <derek.su@suse.com>

examples/network-policy/recovery-backend-network-policy.yaml

@@ -0,0 +1,16 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: longhorn-recovery-backend
+  namespace: longhorn-system
+spec:
+  podSelector:
+    matchLabels:
+      app: longhorn-recovery-backend
+  policyTypes:
+  - Ingress
+  ingress:
+  - ports:
+    - protocol: TCP
+      port: 9600
+