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

how will run gitlab-runner-register.sh file, when we do docker-compose.yml up

how will run gitlab-runner-register.sh file, when we do docker-compose.yml up

Once the Docker container is executed and configured, navigate to the following address: example.com/root/${project}/settings/ci_cd

Replace ${project} with the name of your project. If you don't have one, you will need to create it and retrieve your registration token at this address. Insert the token into the shell script and run it. (Outside the Docker container), the script connects to the container.

For further automation, manual intervention is required, as I have not proceeded with automation beyond this point.

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