You create the user, the database, and then initialize it with the included script.
createuser --pwprompt greylite
createdb --owner greylite greylite
psql -U greylite --file scripts/postgresql.sql greylite
Done.
You will need the following environment variables for this database configuration:
DBRESOURCE="hostaddr=127.0.0.1 port=5432 dbname=greylite user=greylite password=yourpass"
See greylite controls for more information.