npx react-native run-android failed "Execution failed for task ':app:validateSigningDebug'."

[askpatrickw]

This is probably an FAQ or doc update, but if you hit this issue, you can work around it by copying ANY debug.store to
/...yourpath.../aws-amplify-auth-starters/android/app/debug.keystore

For example:
cp /...yourpath.../aws-amplify-auth-starters/node_modules/react-native/template/android/app/debug.keystore /...yourpath.../aws-amplify-auth-starters/android/app/

And then the build worked.

Log:

Task :app:validateSigningDebug FAILED

Deprecated Gradle features were used in this build, making it incompatible 
with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.0.1/userguide/command_line_interface.html#sec:command_line_warnings
150 actionable tasks: 3 executed, 147 up-to-date

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:validateSigningDebug'.
> Keystore file '/...yourpath.../aws-amplify-auth-starters/android/app/debug.keystore' 
not found for signing config 'debug'.
* Try:
Run with --stacktrace option to get the stack trace. 
Run with --info or --debug option to get more log output.
Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 12s