re-creating the LXC container from scratch is expensive. When
rebooting or when multiple units start at the same time, it may cause
an execessive load.
Use a global lock to guard this operation so they happen in sequence
and not in parallel. They typically take around one minute to complete
which means that in the event of a reboot, it will take around 1
minutes * the number of runners for the unlucky one to start.
During this interval workflows will have to wait.