title: SPM cache not working on github actions, any ideas?
body: <p>I am trying to cache the SPM packages on GitHub Actions with <a href="https://github.com/actions/cache" rel="nofollow noreferrer">cache action</a>, I am following this example:</p>
  <pre><code>  - uses: actions/cache@v2
    with:
      path: Myproject.xcworkspace/xcshareddata/swiftpm/Package.resolved
      key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
      restore-keys: |
        ${{ runner.os }}-spm-
  </code></pre>
  <p>I feel like is not possible to use cache, when you add your SPM packages with Xcode</p>
  <p>Did anyone have succeed adding cache to your project even managing SPM via Xcode?
  Or maybe something is wrong in my .yml file but unfortunately I could not make it work.</p>