Update firebase.js

add config to env in backend

Author: ashemag

backend/firebase.js

@@ -1,5 +1,7 @@
 import firebase from "@firebase/app";
 import "@firebase/auth";
+import dotenv from "dotenv";
+dotenv.config();
 
 const app = firebase.default.initializeApp({
   apiKey: process.env.REACT_APP_FIREBASE_API_KEY,