title: Making pull requests to a GitHub repository automatically with GitHub Actions
body: <p>I have a file in a GitHub repository that needs updating occasionally by running a command.</p>
  
  <p>As part of a <a href="https://help.github.com/en/articles/configuring-a-workflow" rel="noreferrer">GitHub Workflows</a>, I want to have a bot running a command, and seeing if it creates  a diff on the repo, and if so, make a pull request to the repository automatically. </p>
  
  <p>I have a suspicion that the <a href="https://help.github.com/en/articles/configuring-a-workflow" rel="noreferrer">GitHub Workflows</a> can help me do that as GitHub now lets people run arbitrary containers ("Actions") that do stuff like builds in a repository. I see some official automation workflows that let you "label" and "comment" issues etc here: <a href="https://github.com/actions/starter-workflows/tree/master/automation" rel="noreferrer">https://github.com/actions/starter-workflows/tree/master/automation</a></p>
  
  <p>If I wanted to run an arbitrary command and make a PR to the repository, which GitHub Actions should I be looking at instead of reinventing my own Actions? Any pointers are appreciated.</p>