changed docker file nest to avoid rebuild everything each time, and small changes in chat gateway

tests_hugo/chat_nest_2/src/app.controller.ts

@@ -0,0 +1,8 @@
+import { Controller, Get } from '@nestjs/common';
+
+@Controller()
+export class AppController {
+
+  @Get()
+  getHello() {}
+}

tests_hugo/chat_nest_2/src/app.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { AppController } from './app.controller';
+
+@Module({
+  imports: [],
+  controllers: [AppController],
+  providers: [],
+})
+export class AppModule {}

tests_hugo/chat_nest_2/src/main.ts

@@ -0,0 +1,11 @@
+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+	app.enableCors(options:{
+		origin: ['http://localhost:3000']
+	});
+  await app.listen(8000);
+}
+bootstrap();