0.13.0

• e185863 Make import more verbose for jobs with one task
• 3a2edc7 Cleanup squashfs files if the job is killed during container import
• 6967a3e Move image export to slurm_spank_task_exit
• 7a966fa Make the shared memory mutex robust
• c469c03 Print image import log after import successfully completed
• aaabef0 Make deb/rpm packages compatible with enroot-hardened
• 12413bb Do not mention the entrypoint if it's not executed
• 54b34b0 Discard mounts when attaching to an existing container