ensure that the directory for sys.executable is in the user's path (#14229)

lib/python/qmk/cli/__init__.py

@@ -181,8 +181,14 @@ if int(milc_version[0]) < 2 and int(milc_version[1]) < 4:
     print(f'Your MILC library is too old! Please upgrade: python3 -m pip install -U -r {str(requirements)}')
     exit(127)
 
+# Make sure we can run binaries in the same directory as our Python interpreter
+python_dir = os.path.dirname(sys.executable)
+
+if python_dir not in os.environ['PATH'].split(':'):
+    os.environ['PATH'] = ":".join((python_dir, os.environ['PATH']))
+
 # Check to make sure we have all our dependencies
-msg_install = 'Please run `python3 -m pip install -r %s` to install required python dependencies.'
+msg_install = f'Please run `{sys.executable} -m pip install -r %s` to install required python dependencies.'
 args = sys.argv[1:]
 while args and args[0][0] == '-':
     del args[0]