title: Publishing a port in gitlab-ci-runner using docker
body: <p>I am trying to specify in a gitlab runner that I want my docker image, when running, to publish port 8000. I did not find anything in the gitlab documentation that shows how to do it.</p>
  
  <p>Docker says that it should be specified in the command line, when docker runs, but I have no clue how to do that from within a gitlab runner configuration.</p>
  
  <p>Any ideas?</p>
  
  <p>This is my gitlab runner configuration</p>
  
  <pre><code>[[runners]]
    name="gitlab.foo.com"
    url = "http://gitlab.foo.com/ci"
    token = "23foo"
    executor = "docker"
   [runners.docker]
    tls_verify = false
    image = "foo/laravel"
    privileged = false
    disable_cache = false
    volumes = ["/cache"]
    extra_hosts = ["foo:192.168.1.22"]
  </code></pre>
  
  <p>My docker image exposes port 8000 </p>