After running this configuration for a while, we
noticed that the containers didn't get back up once and the services
failed with the following error:
Error: current system boot ID differs from cached boot ID; an unhandled reboot has occurred.
This is hard to reproduce and seems to be a timing issue. However,
the logs indicated another issue that this patch now solves:
* The ExecStartPost= indicated that the user session got stopped before
which is required or sdnotify=healthy. Add explicit ordering for
user@. This unfortunately requires a statically declared uid.
344ee0cf07