Suggestion : automatically run migrations at image startup

Hi everybody !

I was surprised today to (re)discover that the database migration procedure requires a manual intervention.

I can think of several ways this could easily be done :
* Directly in the default case of the `entrypoint.sh` script (instead of a separate case)
* In the ansible playbook

The current setup seems to purposefully avoid doing so, so I'm wondering : is this a purposeful design choice ? If so, what are the motivations behind this design ?

Otherwise, I'd be glad to give a hand implementing it !