Redirect apex to www canonical domain

The redirect is set up using front door instead of the ruby code

terraform/domains/environment_domains/config/production.tfvars.json

@@ -11,7 +11,11 @@
         "/assets/*"
       ],
       "environment_short": "pd",
-      "origin_hostname": "s118p01-app-as.azurewebsites.net"
+      "origin_hostname": "s118p01-app-as.azurewebsites.net",
+      "redirect_rules": [{
+        "from-domain": "apex",
+        "to-domain": "www.claim-additional-teaching-payment.service.gov.uk"
+      }]
     }
   }
 }

terraform/domains/environment_domains/main.tf

@@ -9,4 +9,5 @@ module "domains" {
   environment         = each.value.environment_short
   host_name           = each.value.origin_hostname
   cached_paths        = try(each.value.cached_paths, [])
+  redirect_rules      = try(each.value.redirect_rules, null)
 }