package:db is an internal package for storing state in a Postgres database.
You will need Docker. On Ubuntu:
snap install docker
docker pull postgres
docker run \
--name spacetraders_postgres \
-p 127.0.0.1:5432:5432 \
-e POSTGRES_USER=postgres \
-e POSTGRES_DB=spacetraders \
-e POSTGRES_PASSWORD=password \
-d \
postgres
docker cp scripts/. spacetraders_postgres:/scripts
docker cp sql/. spacetraders_postgres:/sql
docker exec -it spacetraders_postgres /bin/sh
docker exec spacetraders_postgres /scripts/init_db.sh spacetraders