title: GitLab: Is it possible to run pipeline on a specific runner?
body: <p>Is it possible to run a pipeline on a specific runner? (not using tags)</p>
  
  <p>Is it feasible to use <code>environments</code>, or even <code>gitlab runner exec</code> maybe?</p>
  
  <hr>
  
  <p><strong>Scenario:</strong></p>
  
  <p>Have an existing project with multiple runners already attached to it (specific project token used to register the runner) and has it's own associated tags (so can't change these either).</p>
  
  <p>I'm adding a new runner, however need to test it first to ensure it works, but I need to force the pipeline to build on this machine, without changing any tags, or specific project of the runner.</p>