Excludes a few more files that are temporary, build artifacts, test
artifacts, runtime artifacts, or not used by the application. This has
the consequence of no longer needing to clear compiled assets during
build.
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.
