Unable to patch fonts on Apple silicon
Hello,

I'm trying to patch a font but despite having FontForge installed locally, which is said to be the only prerequisite in the docs, attempting to run the Python script resulted in:

```
» /opt/font-patcher.py         

Nerd Fonts: FontForge module is probably not installed. [See: http://designwithfontforge.com/en-US/Installing_Fontforge.html]
```

So I tried it this way:

```
» fontforge -script /opt/font-patcher.py RecMonoSemicasual-Bold-1.078.ttf 

Copyright (c) 2000-2021. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Version: 20201107
 Based on sources from 2021-03-14 03:27 UTC-D.
The requested file, original-source.otf, does not exist
Traceback (most recent call last):
  File "/opt/font-patcher.py", line 929, in <module>
    main()
  File "/opt/font-patcher.py", line 924, in main
    patcher.patch()
  File "/opt/font-patcher.py", line 88, in patch
    symfont = fontforge.open(self.args.glyphdir + patch['Filename'])
OSError: Open failed
```

So then I tried it this way:

```
» docker run -v unpatched:/in -v patched:/out nerdfonts/patcher -c                          

WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
```

And finally, I tried it this way: 
```
» docker run --platform linux/amd64 --rm -v unpatched:/in -v patched:/out nerdfonts/patcher -c 
```

...which simply fails to launch, whereas Docker notes "Attempts to run Intel-based containers on Apple Silicon machines under emulation can crash as qemu sometimes fails to run the container." Docker's recommended remedy is "encouraging container authors to produce arm64, or multi-arch, versions of their containers." So I'm here to encourage you to please [build a multi-arch](https://www.docker.com/blog/multi-arch-build-and-images-the-simple-way/) version of the Docker image so that I may patch my fonts in peace.

Thank you!