feat: update server port configuration to use environment variable

src/main.ts

@@ -4,6 +4,7 @@ import { SnowflakeUtil } from './core/util/snowflake.util';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import { GlobalExceptionFilter } from './core/exception/global-exception.filter';
 import { GlobalValidationPipe } from './core/pipe/global-validation.pipe';
+import * as process from 'node:process';
 
 async function bootstrap() {
   SnowflakeUtil.initialize(
@@ -30,6 +31,6 @@ async function bootstrap() {
   app.useGlobalPipes(new GlobalValidationPipe());
   app.useGlobalFilters(new GlobalExceptionFilter());
 
-  await app.listen(3000);
+  await app.listen(process.env.APP_PORT || 3000);
 }
 bootstrap();