Make sure that the profiles docker container starts correctly after a reboot

Currently, the docker container that powers profiles.freeside.co.uk doesn’t come up correctly after a reboot. While we’ve implemented a hack in /etc/rc.local to bring it up, it doesn’t appear to have any effect.

I suggest that we implement a new systemd service of type oneshot that depends on the docker service that first sleeps for 30 seconds in ExecStartPre, and then runs sudo docker start beb943d9cd88 or sudo docker container start profiles.

This would be a good first task for a new Freeside admin.