fix: mongo cert write file

Author: eddiejaoude

src/main.ts

@@ -1,10 +1,10 @@
-import fs from 'fs';
 import { ValidationPipe } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
 import { SwaggerModule } from '@nestjs/swagger';
 import { AppModule } from './app.module';
 import { swaggerConfig } from './swagger';
 import * as helmet from 'helmet';
+import fs from 'fs';
 
 async function bootstrap() {
   // DigitalOcean Apps has cert as environment variable but Mongo needs a file path