Connecting Adminer to sqlite3 DB in docker-compose-yml

I have a Directus 10.6 instance running here on DO, setup via docker-compose.yml and using a sqlite3 DB. Now I would like to use Adminer to administer the DB, but unfortunately I cannot get it to work. This is my docker-compose.yml:

version: '3'
services:
  cache_jvds:
    image: redis:7
    networks:
      - jvds
    env_file:
      - .env

  directus_jvds:
    image: directus/directus:10.6.1
    ports:
      - 8056:8055 # external:internal
    volumes:
      - ./uploads:/directus/uploads
      - ./database:/directus/database
      - ./extensions:/directus/extensions
    networks:
      - jvds
    depends_on:
      - cache_jvds
    env_file:
      - .env

  adminer_jvds:
    image: 'adminer:standalone'
    ports:
      - 8080:8080
    depends_on:
      - directus_jvds
    networks:
      - jvds
    env_file:
      - .env

networks:
  jvds:
    name: jvds
    external: true

Adminr should open on https://jvds.scores-catalog.org:8080 if I am not mistaken. Can anybody tell me, why this is not working?