Refactor prevent_destroy logic to use local variable

Moved the prevent_destroy logic into a local variable in locals.tf and updated resource lifecycle blocks in web-app.tf to reference local.prevent_destroy. This centralizes environment-based lifecycle configuration for easier maintenance.

Author: WayneGoosen

infra/locals.tf

@@ -14,4 +14,7 @@ locals {
 
   # Log level based on environment
   log_level = var.environment == "prod" ? "Warning" : "Verbose"
+  
+  # Prevent destroy for production environment
+  prevent_destroy = var.environment == "prod"
 }

infra/web-app.tf

@@ -8,7 +8,7 @@ resource "azurerm_service_plan" "service_plan" {
   tags = local.common_tags
 
   lifecycle {
-    prevent_destroy = var.environment == "prod" ? true : false
+    prevent_destroy = local.prevent_destroy
   }
 }
 
@@ -48,6 +48,6 @@ resource "azurerm_linux_web_app" "web-app" {
   tags = local.common_tags
 
   lifecycle {
-    prevent_destroy = var.environment == "prod" ? true : false
+    prevent_destroy = local.prevent_destroy
   }
 }