db_sqldump/docker-compose.yml

version: '3.3'

services:
   sqldump:
     container_name: db_sqldump
     image: mariadb:10.6
     volumes:
             - ./data/:/mnt/backup/
     restart: always
     networks:
       - db_default
     env_file:
       - .env
     entrypoint: mnt/backup/dump.sh
networks:
     db_default:
       external: true