Restore default BuildKit builder

scripts/enforce_labels.bash

@@ -30,6 +30,6 @@ done
 
 # generate new image
 if [ -n "${label_args+x}" ]; then
-    run_command="echo \"FROM $image_name\" | DOCKER_BUILDKIT=0 docker build $label_args -t $image_name -"
+    run_command="echo \"FROM $image_name\" | docker build $label_args -t $image_name -"
     eval "$run_command"
 fi