QMK Userspace (#22222)

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

lib/python/qmk/commands.py

@@ -3,10 +3,12 @@
 import os
 import sys
 import shutil
+from pathlib import Path
 
 from milc import cli
 import jsonschema
 
+from qmk.constants import QMK_USERSPACE, HAS_QMK_USERSPACE
 from qmk.json_schema import json_load, validate
 from qmk.keyboard import keyboard_alias_definitions
 
@@ -75,6 +77,10 @@ def build_environment(args):
             envs[key] = value
         else:
             cli.log.warning('Invalid environment variable: %s', env)
+
+    if HAS_QMK_USERSPACE:
+        envs['QMK_USERSPACE'] = Path(QMK_USERSPACE).resolve()
+
     return envs