update_automation: drop usage of temp tarballs
update_automation: drop usage of temp tarballs

by using a direct pipe and thus avoid associated problems

SUSE-Cloud/automation,gosipyan/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,vmoravec/automation,vmoravec/automation,vmoravec/automation,SUSE-Cloud/automation,aspiers/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,SUSE-Cloud/automation,vmoravec/automation,aspiers/automation