title: Fastlane Android Build in flutter issue
body: <p>When I take to build for the flutter app using Fastlane, the APK is being generated in a build folder outside the android folder.</p>
  <p>The message after the successful build of android is</p>
  <blockquote>
  <p><em>Couldn't find any new signed apk files...</em></p>
  </blockquote>
  <p>The generated paths are all empty.</p>
  <p><a href="https://i.stack.imgur.com/5xer4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5xer4.png" alt="Generated paths" /></a></p>
  <p>But I found a generated APK outside the android folder in the path</p>
  <blockquote>
  <p><strong>build/app/outputs/apk/release/app-release.apk</strong></p>
  </blockquote>
  <p>Will be the generated APK path be constant or will change with the future releases of flutter?
  How to solve this issue?</p>
  <p>Also, the GitHub issue for the same has been closed due to lack of inactivity.
  ref: <a href="https://github.com/fastlane/fastlane/issues/15278" rel="nofollow noreferrer">github</a></p>