Add gitlab application

[chendelin1982]

1. var: docker_apps_gitlab_port=["9090", "2224"]
2. compose.yml

   
   # Refert to: https://docs.gitlab.com/omnibus/docker/#install-gitlab-using-docker-compose
   version: "2.0"
   services:
   gitlab:
     image: gitlab/gitlab-ee:latest
     container_name: "{{docker_appname}}"
     environment:
       GITLAB_OMNIBUS_CONFIG: |
         external_url 'http://127.0.0.1:{{docker_apps_gitlab_port[0]}}'
         gitlab_rails['gitlab_shell_ssh_port'] = 2224
     restart: always
     ports:
      - {{docker_apps_gitlab_port[0]}}:80
      - {{docker_apps_gitlab_port[1]}}:2224
     volumes:
      - "{{docker_apps_dir}}/{{docker_appname}}/config:/etc/gitlab"
      - "{{docker_apps_dir}}/{{docker_appname}}/logs:/var/log/gitlab"
      - "{{docker_apps_dir}}/{{docker_appname}}/data:/var/opt/gitlab"

networks: default: external: name: "{{docker_addnetwork}}"

[chendelin1982]

Gitlab is not suitable in role_docker