Add global backend config argument

Author: jiangpengcheng

config/default/manager_auth_proxy_patch.yaml

@@ -14,6 +14,8 @@ spec:
         - "--metrics-addr=0.0.0.0:8443"
         - "--enable-leader-election"
         - "--namespaced-backend-config=backend-config"
+        - "--global-backend-config=global-backend-config"
+        - "--global-backend-config-namespace=sn-system"
         ports:
           - containerPort: 8443
             name: metrics

config/manager/manager.yaml

@@ -34,6 +34,8 @@ spec:
         args:
         - --enable-leader-election
         - --namespaced-backend-config=backend-config
+        - --global-backend-config=global-backend-config
+        - --global-backend-config-namespace=sn-system
         image: controller:latest
         name: manager
         resources: