[FEATURE] Fastdl Directory Exclusion (/maps/workshop/)

## User Story

As a CS:GO Server Owner, I want to be able to exclude the workshop directory (maps/workshop/) so that I don't convert them over to the fastdl, as this is a waste of space, and my server host has a small-ish space limit. Workshop maps get downloaded from the workshop, and skip fastdl, so copying and compressing these is unnecessary and just increases file size redundantly.

## Basic info

* **Distro:** [Arch Linux]
* **Game:** [CS:GO / Fastdl]
* **LinuxGSM version:** [v20.1.3]

## Further Information

The feature I am asking for is the ability to exclude the /maps/workshop/ directory from being copied and compressed to the fastdl. This can be achieved through a parameter or config setting.