chore(backend): update template to v0.4.0

backend/docker-compose.yml

@@ -87,6 +87,7 @@ services:
       POSTGRES_USER: ${DB__USER:-beavergram}
       POSTGRES_PASSWORD: ${DB__PASSWORD:-beavergram}
       POSTGRES_DB: ${DB__DB_NAME:-beavergram}
+      PGPORT: ${DB__PORT:-5432}
     volumes:
       - pgdata:/var/lib/postgresql/data
       - ./backend/migrations/init:/docker-entrypoint-initdb.d:ro