Tribunals: point back some route53 records at the old ngninx LB (#8825)

terraform/environments/tribunals/dns-delegate-route53.tf

@@ -37,7 +37,10 @@ locals {
     "charity",
     "consumercreditappeals",
     "estateagentappeals",
-    "fhsaa",
+    "fhsaa"
+  ]
+
+  nginx_records_pre_migration = [
     "siac"
   ]
 
@@ -117,6 +120,20 @@ resource "aws_route53_record" "nginx_instances" {
   }
 }
 
+resource "aws_route53_record" "nginx_instances_pre_migration" {
+  count    = local.is-production ? length(local.nginx_records) : 0
+  provider = aws.core-network-services
+  zone_id  = local.production_zone_id
+  name     = local.nginx_records_pre_migration[count.index]
+  type     = "A"
+
+  alias {
+    name                   = "tribunals-nginx-1184258455.eu-west-1.elb.amazonaws.com"
+    zone_id                = "Z32O12XQLNTSW2"
+    evaluate_target_health = false
+  }
+}
+
 # 'A' records for tribunals www. URLs redirects to existing entries - subtract the "www."
 resource "aws_route53_record" "www_instances" {
   count    = local.is-production ? length(local.www_records) : 0