Add keymap-drawer workflow

I haven't tuned the output. For now this is just a demonstration of the
workflow.

draw/config.yaml

@@ -0,0 +1,8 @@
+parse_config:
+  zmk_preamble: "#include <zmk-helpers/key-labels/34.h>"
+  zmk_additional_includes:
+    - "modules/helpers/include"
+
+draw_config:
+  footer_text: "urob/zmk-config"
+  dark_mode: auto

draw/default.nix

@@ -0,0 +1,46 @@
+{
+  lib,
+  buildPythonApplication,
+  fetchPypi,
+  poetry-core,
+  pydantic,
+  pcpp,
+  pyparsing,
+  pyyaml,
+  platformdirs,
+  pydantic-settings,
+}:
+buildPythonApplication rec {
+  pname = "keymap-drawer";
+  version = "0.18.0";
+  pyproject = true;
+
+  src = fetchPypi {
+    pname = "keymap_drawer";
+    inherit version;
+    hash = "sha256-faJB+cjj740Ny2wqVwc5t/+grEWBIEyhex3RoLCuIs8=";
+  };
+
+  postPatch = ''
+    substituteInPlace pyproject.toml --replace 'platformdirs = "^3.5.1"' 'platformdirs = "^4.0.0"'
+  '';
+
+  build-system = [poetry-core];
+
+  propagatedBuildInputs = [
+    pydantic
+    pcpp
+    pyparsing
+    pyyaml
+    platformdirs
+    pydantic-settings
+  ];
+
+  doCheck = false;
+
+  meta = {
+    homepage = "https://github.com/caksoylar/keymap-drawer";
+    description = "Parse QMK & ZMK keymaps and draw them as vector graphics";
+    license = lib.licenses.mit;
+  };
+}