Refactor enabling beta launch stage to local with variable override

locals.tf

@@ -6,4 +6,10 @@ locals {
 
   # Should a DNS domain mapping be created?
   domain_mapping_present = var.dns_name != ""
+
+  # Do we need to enable the 'beta' launch stage - only required if certain beta
+  # functionality is being used, or if `enable_beta_launch_stage` is set downstream
+  enable_beta_launch_stage = (
+    var.enable_beta_launch_stage || var.allowed_ingress != "all" || var.min_scale > 0
+  )
 }

main.tf

@@ -38,7 +38,7 @@ resource "google_cloud_run_service" "webapp" {
       },
 
       # Add the beta launch stage if required.
-      var.allowed_ingress != "all" || var.min_scale > 0 ? {
+      local.enable_beta_launch_stage ? {
         # Required to be able to set ingress type.
         "run.googleapis.com/launch-stage" : "BETA",
       } : {},

variables.tf

@@ -163,3 +163,8 @@ variable "template_annotations" {
     template.
   EOL
 }
+
+variable "enable_beta_launch_stage" {
+  default     = false
+  description = "Force use of the 'BETA' launch stage for the service."
+}