title: Can Flutter iOS builds be sped up on Github Actions?
body: <p>I'm trying to distribute an iOS app on Github Actions that was made with Flutter.</p>
  <p>The whole process takes 12 minutes to do the archive before distribution. The project is just for the template Flutter project you get when you create a new project. There's no other bits of code.</p>
  <p>There are three areas that take a non-trivial amount of time:</p>
  <p>Running <code>subosito/flutter-action@v1</code> takes just over 1 minute.</p>
  <p>Running <code>flutter build ipa --flavor MyAppStaging --release --export-options-plist=.github/stagingExportOptions.plist</code> takes about 10 minutes</p>
  <p>Running <code>actions/upload-artifact@master</code> takes about 1 minute.</p>
  <p>Is there some sort of optimisation that I can do?</p>