Add automatic migrations on server startup

[florian-glombik]

Is your feature request related to a problem? Please describe.
Migrations need to be done manually and add some steps on the first setup that could be automated for a faster "out of the box" Quickstart.

Describe the solution you'd like

• Create database on first startup
• add environment variable to define if auto migrations shall be applied (may be breaking!)
• adjust README startup guide