add enable_alerting variable to infra

This is set in variables.tfvars and is needed to
decide whether alerting on the app-insights module
is setup (in
infrastructure/modules/app-insights/alerts.tf on
the dtos-devops-templates repo)

Author: Harriethw

infrastructure/modules/container-apps/variables.tf

@@ -156,7 +156,7 @@ variable "use_apex_domain" {
 }
 
 variable "enable_alerting" {
-  description = "Whether monitoring and alerting is enabled for the PostgreSQL Flexible Server."
+  description = "Whether monitoring and alerting is enabled."
   type        = bool
 }
 

infrastructure/modules/infra/variables.tf

@@ -48,6 +48,11 @@ variable "cae_zone_redundancy_enabled" {
   type        = bool
 }
 
+variable "enable_alerting" {
+  description = "Whether monitoring and alerting is enabled."
+  type        = bool
+}
+
 locals {
   hub_vnet_rg_name = "rg-hub-${var.hub}-uks-hub-networking"
 }