Off topic to rancher maybe but how about [a tool for] treating (packaging) docker images as [Debian/rpm] packages, at least persistent images (images that are n

Off topic to rancher maybe but how about [a tool for] treating (packaging) docker images as [Debian/rpm] packages, at least persistent images (images that are not one shot jobs) ? Some of the images workflow as deploying/removing from a host, replacing existing images (upgrades), dependency management (app image v1.0 depends on Nginx image v2.0), metadata like OS startup scripts (pg image needs to start on boot) seems to already be covered by apt/rpm and that tools like Ansible/others leverage for deployments in infrastructures.