unexpected volume - Githubissues

Im a little bit puzzled, could be an error on my side, im docker newbie:

I use this docker compose configuration with Traefik 3x and Mailcow, works fine:

    certdumper:
      image: ghcr.io/kereis/traefik-certs-dumper
      command: --restart-containers ${COMPOSE_PROJECT_NAME}-postfix-mailcow-1,${COMPOSE_PROJECT_NAME}-nginx-mailcow-1,${COMPOSE_PROJECT_NAME}-dovecot-mailcow-1
      network_mode: none
      volumes:
          # Mount the volume which contains Traefik's `acme.json' file
          #   Configure the external name in the volume definition
        - acme:/traefik:ro
          # Mount mailcow's SSL folder
        - ./data/assets/ssl/:/output:rw
          # Mount docker socket to restart containers
        - /var/run/docker.sock:/var/run/docker.sock:ro
      restart: always
      environment:
          # only change this, if you're using another domain for mailcow's web frontend compared to the standard config
        - DOMAIN=${MAILCOW_HOSTNAME}

volumes:
  acme:
    external: true
    # Name of the external docker volume which contains Traefik's `acme.json' file
    name: traefik_acme

The thing which puzzles me, im always getting a unnamed volume when certdumper runs, which gets abandoned after every restart:

# docker container inspect  -f '{{ range .Mounts }}{{ .Name }}:{{ .Destination }} {{ end }}'  260f7a6a611e

:/output :/var/run/docker.sock traefik_acme:/traefik d31e21dba89964178c9fe031131c15469ccec6a3a8d25764d1ddf9ce78e01a9a:/var/lib/docker

Where is the volume linked to /var/lib/docker coming from?

Thanks for this nice little piece of sw!

kereis / traefik-certs-dumper

unexpected volume #194