given customer id in response in user login

src/index.js

@@ -221,6 +221,7 @@ fastify.post("/api/login", {
             access_token: token,
             email: loginObject.user.emails,
             phone: loginObject.user.phone,
+            customerId: loginObject.user.customerId,
             username: loginObject.user.username,
             address1:  loginObject.user.profile.address1,
             address2:  loginObject.user.profile.address2,