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This creates a separate user named 'cloudron-support' using which we can provide remote support. The hyphen username convention follows the systemd sytem username convention. With a separate user, we don't need to ask users to keep changing PermitRootLogin (and remind them to change it back). Using a sudo user has various advantages: * https://askubuntu.com/questions/687249/why-does-ubuntu-have-a-disabled-root-account * https://wiki.debian.org/sudo * https://askubuntu.com/questions/16178/why-is-it-bad-to-log-in-as-root The yellowtent user is also locked down further - no password and no shell login.