Added new env variable PGUSER in order to easily run tools such as ps…

…ql and pg_dump

docker-compose.dev.yml

@@ -36,6 +36,7 @@ services:
       - pg-only
     image: docker.io/library/postgres:13.2
     environment:
+      - PGUSER=${BH_POSTGRES_USER:-bloodhound}
       - POSTGRES_USER=${BH_POSTGRES_USER:-bloodhound}
       - POSTGRES_PASSWORD=${BH_POSTGRES_PASSWORD:-bloodhoundcommunityedition}
       - POSTGRES_DB=${BH_POSTGRES_DB:-bloodhound}