Add a GitHub Action sample for Flix

[DanielJette]

What does this change accomplish?

This change demonstrates the use of several new GitHub Actions being provided by ndtp

How have you achieved it?

1. android-avd-manager-action - GitHub Action to Create an Android Emulator AVD
2. enable-kvm-action - Enable hardware accelerated emulators on Linux runners
3. android-emulator-runner - Launch an Android Emulator in your GitHub Actions workflow
4. android-instrumentation-test-runner - GitHub Action to run Android Instrumentation tests.

Scope of Impact and Testing instructions

This PR demonstrates the usage of each of these actions

Notice

Warning

This change must keep main in a shippable state; it may be shipped without further notice.