In docker-compose.yml:

    # ...
    environment:
      - 'INFOMANIAK_ACCESS_TOKEN=<token>'
    # ...
    command:
      # ...
      - '--certificatesresolvers.letsencrypt.acme.dnschallenge=true'
      - '--certificatesresolvers.letsencrypt.acme.dnschallenge.resolvers=ns41.infomaniak.com,ns42.infomaniak.com'
      - '--certificatesresolvers.letsencrypt.acme.dnschallenge.provider=infomaniak'
      # ...