This commit updates directory permissions to be compatible with
OpenShift which starts the container with an arbitrary uid which is
member of the root group. For more information please consult
https://docs.openshift.org/latest/creating_images/guidelines.html.
dumb-init is added to have a proper PID 1. bash should not run as PID 1
as this could lead to improper container shutdown.
This commit adds a Docker infrastructure that is ready for production
use. It is meant to simplify the deployment of OSEM for everyone who
wants to host their own instances.
It includes many features like data persistence, automatic secret key
generation and persistence and automatic database initialization and
upgrading. This should make updating the Docker container as easy as
possible.
