Create assets on first run in production mode
Currently, starting RDMS after rebuilding and reinstalling it from
scratch in RAILS_ENV=production mode fails because assets are not
created automatically. I'd prefer to put the required commands into the
Dockerfile, but this doesn't work currently because the path used to
store these assets is a Docker volume shared between multiple Docker
containers, which are not available at build time of these container
images/execution time of the corresponding Dockerfile. Therefore, for
the time being, we execute the commands in the container's
hyrax/docker-entrypoint.sh.
Closes #34 (closed)