docker-compose-gitlab.yml

version: '3.5'

services:

  gitlab:
    image: gitlab/gitlab-ce:latest
    container_name: gitlab
    restart: always
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'http://${GITLAB_HOST}'
        registry_external_url 'http://${GITLAB_REGISTRY_HOST}'
        gitlab_rails['initial_root_password'] = 'passw0rd'
        gitlab_rails['initial_shared_runners_registration_token'] = 't0ken'
    ports:
      - 80:80
    volumes:
      - ./gitlab/config:/etc/gitlab
      - ./gitlab/logs:/var/log/gitlab
      - ./gitlab/data:/var/opt
    networks:
      default:
        aliases:
          - "${GITLAB_HOST}"
          - "${GITLAB_REGISTRY_HOST}"
          - "${GITLAB_PAGES_HOST}"

  gitlab-runner:
    image: gitlab/gitlab-runner:alpine
    container_name: gitlab-runner
    restart: always
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ./gitlab-runner/config:/etc/gitlab-runner
    depends_on:
      - gitlab

  register-gitlab-runner:
    image: gitlab/gitlab-runner:alpine
    volumes:
      - ./gitlab-runner/config:/etc/gitlab-runner
    command:
      - register
      - --non-interactive
      - --locked=false
      - --run-untagged
      - --name=GitLab Runner
      - --tag-list=docker,dind
      - --executor=docker
      - --docker-image=docker:stable
      - --docker-volumes=/var/run/docker.sock:/var/run/docker.sock
      - --docker-network-mode=gitlab-default
    environment:
      - "CI_SERVER_URL=http://${GITLAB_HOST}"
      - "REGISTRATION_TOKEN=t0ken"
    depends_on:
      - gitlab

networks:
  default:
    name: gitlab-default

@BuildWithLal your should change a feature flag to be able to revert back to previous behavior, ref. link https://docs.gitlab.com/ee/administration/settings/continuous_integration.html#enable-runner-registrations-tokens