Set externalTrafficPolicy:Local for nginx-ingress

ansible/roles/apps/templates/settings/ingress.yaml

 controller:
   service:
     externalIPs: ["{{ ip_address }}"]
+    ## Set external traffic policy to: "Local" to preserve source IP on
+    ## providers supporting it
+    ## Ref: https://kubernetes.io/docs/tutorials/services/source-ip/#source-ip-for-services-with-typeloadbalancer
+    externalTrafficPolicy: Local
   resources:
     limits:
       cpu: 100m