complete Gitlab installation and a runner with docker

docker-compose.yml

version: '4.5'
services:

  # GITLAB
  gitlab-web:
    image: 'gitlab/gitlab-ce:latest'
    restart: always
    container_name: gitlab-web
    hostname: '192.168.0.14'
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'http://192.168.0.14'
        gitlab_rails['gitlab_shell_ssh_port'] = 2222
    ports:
      - "80:80"
      - "443:443"
      - "2222:22"
    volumes:
      - './gitlab/config:/etc/gitlab'
      - './gitlab/logs:/var/log/gitlab'
      - './gitlab/data:/var/opt/gitlab'
    networks:
      - gitlab-network

  # RUNNER
  gitlab-runner1:
    image: gitlab/gitlab-runner:alpine
    restart: always
    container_name: gitlab-runner1
    hostname: gitlab-runner1
    depends_on:
      - gitlab-web
    volumes:
     - ./config/gitlab-runner:/etc/gitlab-runner
     - /var/run/docker.sock:/var/run/docker.sock
    networks:
        - gitlab-network

networks:
  gitlab-network:
    name: gitlab-network

gitlab-runner-register.sh

#!/bin/sh
###################################################################
# Récuperer le token d'enregistrement du runner via ce lien:
# http://localhost:8080/root/${project}/settings/ci_cd
# Benoit Petit: https://github.com/benoitpetit
###################################################################

# modifier avec votre token
registration_token=XXXXXXXXXXXXXXX
url=http://127.0.0.1

docker exec -it gitlab-runner1 \
  gitlab-runner register \
    --non-interactive \
    --registration-token ${registration_token} \
    --locked=false \
    --description docker-stable \
    --url ${url} \
    --executor docker \
    --docker-image docker:stable \
    --docker-volumes "/var/run/docker.sock:/var/run/docker.sock" \
    --docker-network-mode gitlab-network
    
# executer le script pour inscrire le runner dans Gitlab

Thanks! :-)
I found an auto register version for the runner for inspiration of your work and this combined might be helpful for those passing by:
https://gitlab.com/TyIsI/gitlab-runner-docker-compose/-/blob/main/docker-compose.yml?ref_type=heads