Add Backstage extra container arguments for Cloud SQL instance config…

…uration

deployments/regional/locals.tf

@@ -28,6 +28,7 @@ locals {
   } : {}
 
   helm_values = {
+    "backstage.extraContainers[0].args[2]"               = "${data.google_project.backstage.project_id}:${module.helpers.region}:${module.cloud_sql.instance}"
     "backstage.image.registry"                           = local.registry
     "backstage.image.tag"                                = var.backstage_version
     "backstage.podLabels.tags\\.datadoghq\\.com/env"     = module.helpers.environment