cleanup build files in root

Author: archmoj

.circleci/config.yml

@@ -93,7 +93,7 @@ jobs:
             npm run docker -- setup
       - run:
           name: Run image tests (part A)
-          command: ./.circleci/test.sh stable-image
+          command: ./.circleci/test.sh stable-image ; find build -maxdepth 1 -type f -delete
       - store_artifacts:
           path: build
           destination: /