Istio configuration to setup multiple ingress gateways

istio.multiple-ingress.yaml

apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  namespace: istio-system
  name: multiple-ingress-istiocontrolplane
spec:
  profile: default
  values:
    security:
      selfSigned: false
    global:
      controlPlaneSecurityEnabled: true
      mtls:
        enabled: true
      meshExpansion:
        enabled: true   
  addonComponents:
    grafana:
      enabled: false
    kiali:
      enabled: true
    prometheus:
      enabled: true
  components:
      ingressGateways:
      - name: istio-internal-ingressgateway
        enabled: true
        k8s:
          serviceAnnotations:
            service.beta.kubernetes.io/azure-load-balancer-internal: "true"
          hpaSpec:
            maxReplicas: 5
            metrics:
            - resource:
                name: cpu
                targetAverageUtilization: 80
              type: Resource
            minReplicas: 1
            scaleTargetRef:
              apiVersion: apps/v1
              kind: Deployment
              name: istio-internal-ingressgateway
          resources:
            limits:
              cpu: 2000m
              memory: 1024Mi
            requests:
              cpu: 100m
              memory: 128Mi
          strategy:
            rollingUpdate:
              maxSurge: 100%
              maxUnavailable: 25%
          overlays:
            - kind: HorizontalPodAutoscaler
              name: istio-internal-ingressgateway
              patches:
                - path: metadata.labels.app
                  value: istio-internal-ingressgateway
                - path: metadata.labels.istio
                  value: internal-ingressgateway
                - path: spec.scaleTargetRef.name
                  value: istio-internal-ingressgateway
            - kind: Deployment
              name: istio-internal-ingressgateway
              patches:
                - path: metadata.labels.app
                  value: istio-internal-ingressgateway
                - path: metadata.labels.istio
                  value: internal-ingressgateway
                - path: spec.selector.matchLabels.app
                  value: istio-internal-ingressgateway
                - path: spec.selector.matchLabels.istio
                  value: internal-ingressgateway
                - path: spec.template.metadata.labels.app
                  value: istio-internal-ingressgateway
                - path: spec.template.metadata.labels.istio
                  value: internal-ingressgateway
            - kind: Service
              name: istio-internal-ingressgateway
              patches:
                - path: metadata.labels.app
                  value: istio-internal-ingressgateway
                - path: metadata.labels.istio
                  value: internal-ingressgateway
                - path: spec.selector.app
                  value: istio-internal-ingressgateway
                - path: spec.selector.istio
                  value: internal-ingressgateway
      - name: istio-ingressgateway
        enabled: true
        k8s:
          hpaSpec:
            maxReplicas: 5
            metrics:
            - resource:
                name: cpu
                targetAverageUtilization: 80
              type: Resource
            minReplicas: 1
            scaleTargetRef:
              apiVersion: apps/v1
              kind: Deployment
              name: istio-ingressgateway
          resources:
            limits:
              cpu: 2000m
              memory: 1024Mi
            requests:
              cpu: 100m
              memory: 128Mi
          strategy:
            rollingUpdate:
              maxSurge: 100%
              maxUnavailable: 25%