[Feature request] Restoring all apps on server reboot runs `restore` in serial mode: `dokku-redeploy` logs: ``` ! Running restore in serial mode ``` Provide an option or make it default to run in parallel and use all available CPU's (`--parallel -1`) Related slack thread: https://gliderlabs.slack.com/archives/C0FP0R13J/p1638463645038200 Related docs change issue: https://github.com/dokku/dokku/issues/4966