Restore the ignore-unused-import lint directive

Author: ojarjur

gateway_provisioners/cli/docker_specapp.py

@@ -89,7 +89,7 @@ def _image_name_default(self):
     def detect_missing_extras(self):
         super().detect_missing_extras()
         try:
-            import docker
+            import docker  # noqa: F401
         except ImportError:
             self.log.warning(
                 "The extra package 'docker' is not installed in this environment and is required.  "