| 123456789101112131415161718192021 | version: '3.8'services:  db:    image: mariadb:10.6 # pinned to stable release    container_name: db    volumes:      - ./data/mysql:/var/lib/mysql/      - ./data/backup:/mnt/backup    restart: on-failure:3    environment:      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}    healthcheck:      test: ["CMD", "/usr/local/bin/healthcheck.sh", "--connect"]      interval: 15s #interval for the first and subsequent checks      timeout: 10s      retries: 3networks:  db_default:    external: true
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