Error when using Docker
#### 🎯 Subject of the issue

Experienced behavior:
Trying to patch fonts using docker, but it errors out.

Expected behavior:
Fonts are patched successfully.

Error:
```
$ docker run -v /path/MonoLisa/ttf:/in -v /path/patched/ttf:/out nerdfonts/patcher
Running with options:
Error relocating /usr/bin/fontforge: FindProgRoot: symbol not found
```

This happens with all the MonoLisa fonts (the error repeats for each file found) as well as FiraCode. Since the error shows up multiple times if I put multiple files in the directory, it seems to be reading the fonts fine.

#### 🔧 Your Setup

- _Which font are you using (e.g. `Anonymice Powerline Nerd Font Complete.ttf`)?_
   - MonoLisa-Regular.ttf
   - I also tried FiraCode-Regular.ttf
- _Where did you get the file from (download link, self patched, source downloaded from link...)_
   - From the MonoLisa website
   - https://github.com/tonsky/FiraCode/releases/download/6.2/Fira_Code_v6.2.zip
- _Which terminal emulator are you using (e.g. `iterm2`, `urxvt`, `gnome`, `konsole`)?_
   - probably not relevant since i'm using docker...but iterm2
- _Are you using OS X, Linux or Windows? And which specific version or distribution?_
   - macOS Ventura, arm64, docker