remove brusnika stage gateway node affinity

clusters/brusnika-stage/infrastructure/patches/istio-gateway.yaml

@@ -5,6 +5,24 @@ metadata:
   namespace: istio-system
 spec:
   targetNamespace: ingress-nginx
+  postRenderers:
+    - kustomize:
+        patches:
+          - target:
+              version: v1
+              kind: Deployment
+              name: istio-ingressgateway
+              namespace: ingress-nginx
+            patch: |-
+              apiVersion: apps/v1
+              kind: Deployment
+              metadata:
+                name: istio-ingressgateway
+                namespace: ingress-nginx
+              spec:
+                template:
+                  spec:
+                    affinity: null
   dependsOn:
     - name: istio-base
       namespace: istio-system