[Bug]: Docker already has an entry in Crontab

### User story

I want the crontab entry to be removed so users are able to set their own wihtout having to remove/comment it out every time the container is restarted.

### Game

PaperMC

### Linux distro

Ubuntu 22.04

### Command

command: update

### Further information

There is a cron entry in the container by default:
```bash
*/60 * * * * /app/pmcserver update > /dev/null 2>&1
```
I don't know if this is intentional, but it is very annoying because I'd like to set my own update interval without having to modify the actual application code. I didn't think it was necessary to make an issue for such a small problem. Thanks!

### Relevant log output

_No response_

### Steps to reproduce

1. Use the container lol