The file /etc/passwd has generated a large number of sandbox UIDs

During local development, 1000 sandbox UIDs are generated every time the service is restarted. Additionally, it is unsafe to start the service as the root user

```bash
$ grep "sandbox10" /etc/passwd | wc -l
41000
```
```bash
$ grep "sandbox10000" /etc/passwd | wc -l
41
```
```bash
$ grep "sandbox10999" /etc/passwd | wc -l
41
```