feat(helm): add istio gateway class support (#6264)

helm/rustfs/templates/gateway-api/istio-destinationrule.yaml

@@ -0,0 +1,16 @@
+{{- if and .Values.gatewayApi.enabled (eq .Values.gatewayApi.gatewayClass "istio") }}
+apiVersion: networking.istio.io/v1
+kind: DestinationRule
+metadata:
+  name: {{ include "rustfs.fullname" . }}-sticky
+  namespace: {{ .Release.Namespace }}
+spec:
+  host: {{ include "rustfs.fullname" . }}-svc.{{ .Release.Namespace }}.svc.{{ .Values.clusterDomain }}
+  trafficPolicy:
+    loadBalancer:
+      consistentHash:
+        httpCookie:
+          name: rustfs
+          path: /
+          ttl: 0s
+{{- end }}

helm/rustfs/values.yaml

@@ -361,7 +361,7 @@ ingress:
 
 gatewayApi:
   enabled: false
-  gatewayClass: traefik # Only support for traefik and contour gatewayClass at the moment.
+  gatewayClass: traefik # Supported gatewayClass: traefik, contour, istio.
   listeners: # Specify which listeners to create on the Gateway.
     http:
       name: web