title: GitLab CI: how can I set two dependencies pipelines to run in parallel?
body: <p>At the moment, I have a pipeline defined with 4 different stages to build dependencies for my project:</p>
  
  <pre><code>stages:
    - dependencies-A
    - dependencies-B
    - dependencies-C
    - dependencies-D
    - build
  </code></pre>
  
  <p>Thus, the jobs in the pipeline now run like this:</p>
  
  <pre><code>A -&gt; B -&gt; C -&gt; D -&gt; build
  </code></pre>
  
  <p>Actually, B depends on A, and D depends on C. The sub-pipelines <code>A-&gt;B</code> and <code>C-&gt;D</code> being independent, I would like to run those two sub-pipelines in parallel, to speed up the build. So, that way:</p>
  
  <pre><code>A -&gt; B \
           build
  C -&gt; D /
  </code></pre>
  
  <p>Is that possible at all?</p>
  
  <p>Thanks for your kind help.</p>