acept port setting by env variable

src/app.module.ts

@@ -20,7 +20,6 @@ import { httpCacheAdapter } from './utils/httpCacheAdapter';
     GraphQLModule.forRoot<ApolloDriverConfig>({
       driver: ApolloDriver,
       autoSchemaFile: join(process.cwd(), 'src/schema.gql'),
-      debug: true,
     }),
   ],
   providers: [ThingResolver],

src/main.ts

@@ -3,6 +3,6 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  await app.listen(3000);
+  await app.listen(process.env.PORT || 3000);
 }
 bootstrap();