use config variable to identify admin account while it is created

app/__init__.py

@@ -58,6 +58,10 @@ def user_registered_sighandler(app, user, confirm_token):
     """
     role = user_datastore.find_role('user')
     user_datastore.add_role_to_user(user, role)
+    if user.email == app.config['ADMIN_MAIL']:
+        # if the user selected the preconfigured email for the admin account
+        role = user_datastore.find_role('admin')
+        user_datastore.add_role_to_user(user, role)
     new_vehicle = Vehicle('default vehicle')
     db.session.add(new_vehicle)
     user.vehicles.append(new_vehicle)