title: AppDistribution Gradle plugin with Gradle 7
body: <p>I am using Android Gradle Plugin version <code>7.0.0-alpha14</code> and Gradle version <code>7.0</code> and when I try to upload the app to app distribution through the Gradle plugin version <code>2.1.0</code> it fails on a task <code>app:appDistributionUploadDebug</code> with an error</p>
  <pre><code>&gt; Task :app:appDistributionUploadDebug FAILED
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Some problems were found with the configuration of task ':app:appDistributionUploadDebug' (type 'UploadDistributionTask').
    - Type 'UploadDistributionTask' property 'COMMAND_LINE_PREFIX' is missing an input or output annotation.
      
      Reason: A property without annotation isn't considered during up-to-date checking.
      
      Possible solutions:
        1. Add an input or output annotation.
        2. Mark it as @Internal.
      
      Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.
    - Type 'UploadDistributionTask' property 'appDistributionProperties' is missing an input or output annotation.
      
      Reason: A property without annotation isn't considered during up-to-date checking.
      
      Possible solutions:
        1. Add an input or output annotation.
        2. Mark it as @Internal.
      
      Please refer to https://docs.gradle.org/7.0/userguide/validation_problems.html#missing_annotation for more details about this problem.
  </code></pre>
  <p>I suppose the plugin is not compatible with Gradle 7 but is it a known issue and is there some workaround? Thanks</p>