website: teach Terraform about the "legacy" web frontend resource group

website/variables.tf

@@ -23,6 +23,10 @@ variable "legacyNameCommunitiesStorage" {
   description = "The name to use for the 'legacy' storage account equivalent to 'wwtcommunity' in production"
 }
 
+variable "legacyNameFrontendGroup" {
+  description = "The name to use for the 'legacy' web frontend resource group"
+}
+
 variable "legacyNameWwtcoreDBServer" {
   description = "The name to use for the 'legacy' SQL server with the AstroObjects and WWTTours databases"
 }

website/web-frontend.tf

@@ -0,0 +1,10 @@
+# Terraform definitions of WWT's web frontend: the App Gateway, CDN setup, etc.
+
+resource "azurerm_resource_group" "web_frontend_legacy" {
+  name     = var.legacyNameFrontendGroup
+  location = var.location
+
+  lifecycle {
+    prevent_destroy = true
+  }
+}