add minimal workflow for keymap drawer

[stijnveenman]

Thanks again for the awesome config and write up about it, it gave me a great starting point for my configuration. Consider this my thank you note. :)

It is now possible to use keymap drawer with v2 of zmk-helpers

This PR shows a minimal implementation of it. There is still more configuration required to make it look decent.
With some inspiration of https://github.com/minusfive/zmk-config i have a more complete config on my fork of your config.

Since i made quite some changes to your config, also removing some keys, my config is probably still incomplete for yours. But might give a more complete starting point. See: https://github.com/stijnveenman/zmk-config/blob/main/keymap_drawer.config.yaml

Which renders:

An example of this minimal workflow can be found at: https://github.com/stijnveenman/zmk-config/actions/runs/9920716711

Note: keymap-drawer renders all .keymap files by default (configured in yaml),so with your multiple keyboard configurations it will try and render base.keymap which will fail. But it will still continue with the rest of them. Since i only have one keyboard i hardcoded mine

[urob]

Loving this! I am somewhat buried in work these days so it might take a bit before I'll get to incorporating this here. But I'll get there... :)