add controller_cmd to exclude

.github/workflows/code-checks.yaml

@@ -25,6 +25,7 @@ jobs:
           --exclude-dir='docs'
           --exclude-dir='flower-client'
           --exclude='tests.py'
+          --exclude='controller_cmd.py'
           --exclude='README.rst'
           '^[ \t]+(import|from) ' -I .