first commit

A3/overlays/prod/gateway.yaml

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+apiVersion: networking.istio.io/v1beta1
+kind: Gateway
+metadata:
+  name: prod-gateway
+  namespace: a3-prod
+spec:
+  selector:
+    istio: gateway
+  servers:
+    - port:
+        number: 443
+        name: https
+        protocol: HTTPS
+      tls:
+        mode: SIMPLE
+        credentialName: a3-prod-tls-cert
+      hosts:
+        - a3-prod.gwg313.xyz
+        - a3-prod.local.gwg313.xyz