Description:

The qmk tool has become a requirement for building qmk_firmware keymaps for the compatible keyboards. I believe most of its users use either ARM or AVR keyboard but not both, and this feature request is based on this assumption.

I suggest making the ARM related dependencies optional, or perhaps offer a smaller qmk-avr package. I'm able to build an AVR ergodox_ez keymap fine without installing the ARM packages. Other way around I haven't tested, nor have I knowledge of implications to building other types of keyboards the qmk_firmware supports.

Example of building ergodox_ez default keymap with qmk 1.0.0-2, and saving 1300 MiB disk space:
1. pacman -S qmk --assume-installed arm-none-eabi-binutils=2.37-1 --assume-installed arm-none-eabi-gcc=11.2.0-1 --assume-installed arm-none-eabi-newlib=4.1.0-1
2. git clone https://github.com/qmk/qmk_firmware.git
3. cd qmk_firmware
4. git checkout 8aec20c0da9481c5294b216346231a98570d1626
5. make ergodox_ez:default

The ARM related dependencies, installed size ~1300 MiB:
* arm-none-eabi-gcc
* arm-none-eabi-binutils
* arm-none-eabi-newlib

The AVR related dependencies, installed size ~200 MiB:
* avr-gcc
* avr-libc
* avr-binutils
* avrdude

Rest of the required deps, installed size ~50 MiB:
* python-appdirs
* python-argcomplete
* python-colorama
* python-milc
* python-dotty-dict
* python-jsonschema
* git
* dfu-programmer
* dfu-util
* python-hjson
* python-pygments
* python-hid
* python-pyusb