Change PostgreSQL data volume path to relative

postgressql/docker-compose.yml

@@ -12,7 +12,7 @@ services:
       PUID: 1026
       PGID: 100
     volumes:
-      - /mnt/synoNFS/postgresql:/var/lib/postgresql/data:rw
+      - ./postgresql_data:/var/lib/postgresql/data:rw
     ports:
       - 5432:5432
     restart: always