Update firebase-config.js

firebase-config.js

@@ -1,5 +1,5 @@
 const admin = require('firebase-admin');
-const serviceAccount = require('./firebase-key.json');
+const serviceAccount = JSON.parse(process.env.FIREBASE_SERVICE_ACCOUNT);
 
 try {
   admin.initializeApp({
@@ -20,4 +20,4 @@ db.collection('users').get()
   .then(() => console.log('Firestore connection successful'))
   .catch(err => console.error('Firestore connection error:', err));
 
-module.exports = db;
+module.exports = db;