title: Keeping main branches between fork and upstream repos different
body: <p>I want to keep certain GitHub workflows only in my fork.</p>
  <p>For instance, I don't want to have <code>.github/workflows/syncFork.yml</code> file to be present in the upstream repo.</p>
  <p>Is this possible in the long run?</p>
  <p>I'm afraid ultimately, when I make PR to the original repo, it will contains this file anyway... so the best is to keep main branch between upstream and fork repos exactly the same. Right?</p>
  <p>PS. I know I can disable workflow in the original repo:</p>
  <pre class="lang-yaml prettyprint-override"><code>jobs:
    sync:
      if
        github.repository == 'my-organization/repo'
  </code></pre>