add reset for existing checkout

src/app.service.ts

 import { Connection, Repository } from 'typeorm';
 import { InjectConnection } from '@nestjs/typeorm';
 import { ConsoleLogger, Injectable } from '@nestjs/common';
-import simpleGit, { SimpleGit } from 'simple-git';
+import simpleGit, { ResetMode, SimpleGit } from 'simple-git';
 import { ConfigService } from '@nestjs/config';
 import path from 'path';
 import { File } from './entities/File.entity';
@@ -178,6 +178,9 @@ export class AppService extends ConsoleLogger {
           await this.git.fetch('origin', branchName);
         }
         await this.git.checkout(branchName, ['-f']);
+        if (fetch) {
+          await this.git.reset(ResetMode.HARD, [`origin/${branchName}`]);
+        }
         this.log(`Checked out existing branch ${branchName}`);
       } catch (e) {
         this.error(