Merge branch 'link-technical-auto-devops-video' into 'master'

Link to Auto DevOps technical walk-through video

See merge request gitlab-org/gitlab!31674

doc/development/auto_devops.md

 # Auto DevOps development guide
 
 This document provides a development guide for contributors to
-[Auto DevOps](../topics/autodevops/index.md)
+[Auto DevOps](../topics/autodevops/index.md).
+
+<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
+An [Auto DevOps technical walk-through](https://youtu.be/G7RTLeToz9E)
+is also available on YouTube.
 
 ## Development