feat: Update Terraform configuration for Google Cloud project with Firebase Authentication services

- Added billing_project to Google Cloud providers
- Enabled user_project_override for both providers
- Added Firebase Authentication service resource
- Configured Identity Platform with email/password, phone, and anonymous sign-in
- Set up authorized domains for local and Firebase hosting
- Added dependency relationships between resources

This enhances the project's infrastructure configuration to properly support Firebase Authentication and related services.

main.tf

@@ -1,15 +1,17 @@
 # Configure the Google Cloud provider
 provider "google" {
   project = var.project_id
+  billing_project =  var.project_id
   region  = var.region
-  user_project_override = false
+  user_project_override = true
 }
 
 # Configure the google-beta provider for Firebase resources
 provider "google-beta" {
   project = var.project_id
+  billing_project =  var.project_id
   region  = var.region
-  user_project_override = false
+  user_project_override = true
 }
 
 # Create a new Google Cloud Project
@@ -49,6 +51,15 @@ resource "google_project_service" "firestore_service" {
   depends_on = [google_project_service.firebase_services]
 }
 
+resource "google_project_service" "auth_service" {
+  project = google_project.main_project.project_id
+  service = "identitytoolkit.googleapis.com"
+
+  # Wait for Firebase services to be enabled before enabling Firestore
+  depends_on = [google_project_service.firestore_service]
+}
+
+
 resource "google_firebase_project" "firebase_project" {
   provider = google-beta
   project  = google_project.main_project.project_id
@@ -77,6 +88,54 @@ resource "google_firestore_database" "main_firestore" {
   depends_on = [google_project_service.firestore_service]
 }
 
+# Configure Identity Platform for Firebase Authentication
+resource "google_identity_platform_config" "main_config" {
+  provider = google-beta
+  project  = google_project.main_project.project_id
+
+  # Auto-deletes anonymous users
+  autodelete_anonymous_users = true
+
+  # Configures local sign-in methods, like anonymous, email/password, and phone authentication.
+  sign_in {
+    allow_duplicate_emails = true
+
+    anonymous {
+      enabled = true
+    }
+
+    email {
+      enabled = true
+      password_required = false
+    }
+
+    phone_number {
+      enabled = true
+      test_phone_numbers = {
+        "+11231231234" = "000000"
+      }
+    }
+  }
+
+  # Sets an SMS region policy.
+  sms_region_config {
+    allowlist_only {
+      allowed_regions = [
+        "US",
+        "CA",
+      ]
+    }
+  }
+
+  # Configures authorized domains.
+  authorized_domains = [
+    "localhost",
+    "${google_project.main_project.project_id}.firebaseapp.com",
+    "${google_project.main_project.project_id}.web.app",
+  ]
+  depends_on = [google_project_service.auth_service]
+}
+
 # Output the project ID and name
 output "project_id" {
   value = google_project.main_project.project_id