title: Run jobs in the same stage sequentially in Gitlab CI
body: <p>I want to run jobs in the same stage sequentially instead of parallel in GitLab CI. Currently this is what I have:
  <a href="https://i.stack.imgur.com/YvcuE.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YvcuE.png" alt="enter image description here" /></a></p>
  <p>I want unit-test to run before integration-test and not in parallel. I have looked into the docs and have encountered DAG but it needs the job to be in a prior stage and cannot be on the same stage. Is there a way to achieve this?</p>