fix: use volume for PG data

docker-compose.yml

@@ -109,6 +109,7 @@ services:
     volumes:
       - ./postgres_cfg/postgresql.conf:/etc/postgresql/postgresql.conf:Z
       - ./postgres_cfg/db.sql:/docker-entrypoint-initdb.d/db.sql:Z
+      - ${PG_DATA_DIR:-./postgresql}:/var/lib/postgresql/data:Z
     command: postgres -c config_file=/etc/postgresql/postgresql.conf
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -d db_prod"]