Enable auth-service/api-gateway on production, build their images in CI

apps/api-gateway/src/main.ts

@@ -0,0 +1,12 @@
+import "reflect-metadata";
+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module";
+import { loadSettings } from "./config";
+
+async function bootstrap() {
+  const settings = loadSettings();
+  const app = await NestFactory.create(AppModule);
+  await app.listen(settings.port, "0.0.0.0");
+}
+
+bootstrap();