title: Copy from docker to host inside CI build
body: <p>I would like to know if it would be possible to somehow copy file/folder from inside docker to host but copying itself is executed form inside docker.</p>
  
  <p>The reason is that, for example:</p>
  
  <ul>
  <li>Commit file to repo</li>
  <li>CI kicks in</li>
  <li>Docker installs dependencies, builds the website files</li>
  <li>Website files is copied from docker to /var/www/my-website (host)</li>
  </ul>
  
  <p>When I was searching for a solution I've seen this command a lot <code>docker cp &lt;containerId&gt;:/file/path/within/container /host/path/target</code> however this is executed from HOST. I want to make the whole process automated.</p>
  
  <p>Possible solution of course is to not use docker but straight-up SSH, that's what I'm doing now, but that is not the best option IMO.</p>
  
  <p>Here is example of my <code>.gitlab-ci.yml</code> file that will explain what I want to achieve.</p>
  
  <pre><code>image: ubuntu:16.04
  
  build:
      stage: build
      script:
          - apt-get update
          - apt-get upgrade -yy
          - apt-get install hugo -yy # Static site generator
          - hugo build # Build the website
          - cp -R ./build/* /var/www/my-website/ # Copy to the web root
  </code></pre>
  
  <p>Here is my runner configuration</p>
  
  <pre><code>[[runners]]
    name = "DOCKER-TEST"
    url = "https://gitlab.com/ci"
    token = "{{token}}"
    executor = "docker"
    [runners.docker]
      tls_verify = false
      image = "ubuntu:16.04"
      privileged = true
      disable_cache = false
      volumes = ["/cache", "/home/stan:/builds/stanislavromanov/test-docker:rw"]
    [runners.cache]
      Insecure = false
  </code></pre>