Revert "Merged PR 284: エラーの挙動について確認する"

This reverts commit 21ecc1db6b139882848fe573489ba83c442dec81.

dictation_server/src/app.module.ts

@@ -43,15 +43,8 @@ import { TemplateFilesRepositoryModule } from './repositories/template_files/tem
 
 @Module({
   imports: [
-    ServeStaticModule.forRootAsync({
-      useFactory: () =>
-        process.env.STAGE === 'local'
-          ? [
-              {
-                rootPath: join(__dirname, '..', 'build'),
-              },
-            ]
-          : [],
+    ServeStaticModule.forRoot({
+      rootPath: join(__dirname, '..', 'build'),
     }),
     ConfigModule.forRoot({
       envFilePath: ['.env.local', '.env'],