added deploying a docker image to docker hub

backend/config/database.js

@@ -1,9 +1,7 @@
-const CONNECTION_URI = require('../credentials.js');
-
 module.exports = function (mongoose) {
     mongoose.set('useFindAndModify', false);
     mongoose
-        .connect(CONNECTION_URI, {
+        .connect(process.env.CONNECTION_URI, {
             useNewUrlParser: true,
             useUnifiedTopology: true,
             dbName: 'test',

backend/config/session.js

@@ -1,8 +1,8 @@
 const session = require('express-session');
-const CONNECTION_URI = require('../credentials.js');
 const MongoDBStore = require('connect-mongodb-session')(session);
+
 const store = new MongoDBStore({
-    uri: CONNECTION_URI,
+    uri: process.env.CONNECTION_URI,
     collection: 'sessions',
 });
 const sessionMiddleware = session({