title: Gitlab: gem not found
body: <p>I am trying to deploy our app to <code>Heroku</code> and our settings in <code>.gitlab-ci.yml</code> looks like</p>
  
  <pre><code>staging_heroku:
    stage: deploy
    script:
    - git remote add heroku https://heroku:$STAGING_HEROKU_KEY@git.heroku.com/staging-myapp.git
    - git push -f heroku master
  </code></pre>
  
  <p>This is what we see in logs</p>
  
  <pre><code>Cloning repository...
  Cloning into '/builds/org/project'...
  Checking out 340111af as dev/feature1...
  Skipping Git submodules setup
  Downloading artifacts for maven-build (17234382)...
  Downloading artifacts from coordinator... ok        id=17234382 responseStatus=200 OK token=2YSHdANA
  /bin/sh: eval: line 46: apt-get: not found
  $ apt-get update -yqqq
  ERROR: Job failed: exit code 127
  </code></pre>
  
  <p>These runners do not even have <code>apt-get</code> and so I can not install <code>gem</code>.</p>
  
  <p>I even tried <code>git</code> command, but even that is not found. Can someone help?</p>