Remove local tuf-repo before and after using garage-sign.
Remove local tuf-repo before and after using garage-sign.

This mimics the current behavior in bitbake. It is less efficient but
much safer.

advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp