title: How to access previous GitLab CI artifacts, process them and save file in "main" repository?
body: <p>My application for this is to visualize the performance of my software. Therefore I briefly describe what I'm doing and where I'm stuck.</p>
  <ol>
  <li>I have my source code in GitLab</li>
  <li>Compile and run some tests in the CI for each commit</li>
  <li>Measure the time it took for the test run and save it to a file</li>
  <li>Upload the file with the time as an artifact</li>
  </ol>
  <p>--------- From here on I don't know how to achieve it.</p>
  <ol start="5">
  <li>Run some new job that reads all timing files of the previous artifacts</li>
  <li>Plot the times, probably with Python and save the image as SVG in the &quot;main&quot; repository</li>
  <li>Show the image on the GitLab start page (README.md should probably include it)</li>
  <li>Now I see which commits had which impact on my software's performance</li>
  </ol>
  <p>No idea whether I'm asking for the impossible or not. I hope someone can help me as I'm not an CI expert. Maybe a single expression is already enough to google the solution but I don't even know how to formulate this.</p>
  <p>Thanks everyone :)</p>