Add dotenv in configService

src/configuration/config.service.ts

-
+import * as dotenv from 'dotenv';
 import { config } from './config';
 
 export class ConfigService {
   private _config = config;
 
   constructor() {
-
+    dotenv.config();
     // Initializing conf with values from var env
     this._config.smtpConfig.host = process.env.SMTP_HOST;
     this._config.smtpConfig.port = process.env.SMTP_PORT;