I have just this (which ironically won't work now cause docker hub is down)

services:
  registry:
    restart: always
    image: registry:2
    ports:
      - 5000:5000
    dns:
      - 9.9.9.9
      - 1.1.1.1
    volumes:
      - ../files/auth/registry.password:/auth/registry.password
      - registry-data:/var/lib/registry
    environment:
      REGISTRY_STORAGE_DELETE_ENABLED: true
      REGISTRY_HEALTH_STORAGEDRIVER_ENABLED: false
      REGISTRY_HTTP_SECRET: ${REGISTRY_HTTP_SECRET}
      REGISTRY_AUTH: htpasswd
      REGISTRY_AUTH_HTPASSWD_REALM: Registry Realm
      REGISTRY_AUTH_HTPASSWD_PATH: /auth/registry.password
      # REGISTRY_PROXY_REMOTEURL: "https://registry-1.docker.io/"

volumes:
  registry-data:

I don't even remember how and when I set it up. I think it might be this: https://github.com/distribution/distribution/releases/tag/v2.0.0

Recently somebody has created a frontend, which I bookmarked but didn't bother to set up: https://github.com/Joxit/docker-registry-ui