envio de constancias pdf, se añadio banner

src/main.ts

@@ -1,9 +1,11 @@
 import { NestFactory } from '@nestjs/core';
+import { NestExpressApplication } from '@nestjs/platform-express';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
+import { join } from 'path';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
+  const app = await NestFactory.create<NestExpressApplication>(AppModule);
 
   const config = new DocumentBuilder()
     .addBearerAuth()
@@ -14,6 +16,10 @@ async function bootstrap() {
   const document = SwaggerModule.createDocument(app, config);
   SwaggerModule.setup('api', app, document);
 
+  app.useStaticAssets(join(__dirname, '..', 'public'), {
+    prefix: '/public/',
+  });
+
   app.enableCors();
   await app.listen(AppModule.port);
 }