title: Get commits in a push from @actions/github in an action
body: <p>I'm wondering if there is a way to get the commits in a push event from <code>@actions/github</code>?</p>
  <p>I tried <code>GitHub.context.payload.comment</code>, but that's returning undefined.</p>
  <p>Is there a way to do it in javascript/typescript?</p>
  <p>Thanks.</p>