title: How to version build artifacts using GitHub Actions?
body: <p>My use case is I want to have a unique version number for artifacts per each build/run. With current tools like CircleCI, Travis, etc. there is a build number available which is basically a counter that always goes up. So, I can create version strings like <code>0.1.0-27</code>. This counter is increased each time even for the same commit.</p>
  
  <p>How can I do something similar with GitHub Actions? Github actions only offer GITHUB_SHA and GITHUB_REF.</p>