feat: add topology spread constraints for gateway and controller (#3171)

Signed-off-by: Wilson Wu <iwilsonwu@gmail.com>

helm/core/templates/_pod.tpl

@@ -250,6 +250,10 @@ template:
     tolerations:
       {{- toYaml . | nindent 6 }}
     {{- end }}
+    {{- with .Values.gateway.topologySpreadConstraints }}
+    topologySpreadConstraints:
+      {{- toYaml . | nindent 6 }}
+    {{- end }}
     volumes:
     - emptyDir: {}
       name: workload-socket

helm/core/templates/controller-deployment.yaml

@@ -301,6 +301,10 @@ spec:
       tolerations:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with .Values.controller.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       volumes:
       - name: log
         emptyDir: {}

helm/core/values.yaml

@@ -524,6 +524,8 @@ gateway:
 
   affinity: {}
 
+  topologySpreadConstraints: []
+
   # -- If specified, the gateway will act as a network gateway for the given network.
   networkGateway: ""
 
@@ -631,6 +633,8 @@ controller:
 
   affinity: {}
 
+  topologySpreadConstraints: []
+
   autoscaling:
     enabled: false
     minReplicas: 1