title: Appcenter can't find APK file
body: <p>I have this weird error, I've been using appcenter for a long time, but never experienced this.
  I setup a build with appcenter which fetches from azure devops repo. The application is a Xamarin.Android native application. Once I run the build, everything goes well. Untill the signin step. When the step is about to start, I get this error:</p>
  <p><code>##[error]No matching files were found with search pattern: /Users/runner/work/1/s/**/*.apk</code></p>
  <p>Looks like the APK was not found, though the build runs successfully without error.
  Please I need your help to figure out a solution to this issue.</p>