title: If condition in Github Actions for another Job
body: <p>My use case is, to trigger docs build when there is a trigger word in Pull Request Comments.
  I am using <a href="https://github.com/Khan/pull-request-comment-trigger" rel="nofollow noreferrer">pull-request-comment-trigger</a> to know if a <strong>Trigger word</strong> is present in the code.</p>
  <p>After knowing Action is triggered, I want to run some commands inside the repo. So, I have to use <a href="https://github.com/actions/checkout" rel="nofollow noreferrer">actions/checkout</a> for that.</p>
  <p>My doubt is, inside the <code>run</code> command, Only Shell Commands are valid, Right? I want to run another job <strong>if</strong> above condition satisfies.</p>
  <p>My Current Yaml File</p>
  <pre class="lang-yaml prettyprint-override"><code>name: Testing GH Actions
  
  on:
    pull_request:
      types: [opened]
  
  jobs:
    deploy:
      runs-on: ubuntu-latest
      steps:
        - uses: khan/pull-request-comment-trigger@master
          id: check
          with:
            trigger: &quot;AppajiC&quot;
            reaction: rocket
          env:
            GITHUB_TOKEN: &quot;${{ secrets.GITHUB_TOKEN }}&quot;
        - run:
          # Generally Anything here runs if below condition satisfies.
          # I want to run another job here, which uses actions/checkout@v2 action
          if: steps.check.outputs.triggered == 'true'
  </code></pre>
  <p>How can I achieve this ?</p>