Updated script to preload hashes and updated message

The script now uses a new .env variable called PRELOAD which is used
to specify whether the database should be preloaded with hashes.
Currently this is configured to use a role from a specific server.
This will be changed at a later date.

Dockerfile

@@ -10,4 +10,5 @@ RUN python3 -m venv venv && \
 RUN mkdir database && \
     touch database/news.db
 
+
 CMD ["venv/bin/python", "main.py"]