Update "example" keystore to instead be called "debug" and follow the debug.keystore format

[silbinarywolf]

What should this work do?

When using debug keystore we should attempt to locate $HOME/.android/debug.keystore as per Android API docs here. Failing finding it, we should consider trying to generate the debug key and placing it in this directory (if it exists)

What is the motivation?

We won't end up blowing away the keystore generated in .zig-cache anymore which means when developers delete .zig-cache and re-build / upload their APK to their Android devices, they won't need to run uninstall. So this will improve the developer user experience.

Example of generating debug keystore

keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000

• Keystore name: "debug.keystore"
• Keystore password: "android"
• Key alias: "androiddebugkey"
• Key password: "android"
• CN: "CN=Android Debug,O=Android,C=US"

Example directories of debug.keystore

• ~/.android/ on OS X and Linux
• C:\Documents and Settings\user\.android\ on Windows XP
• C:\Users\user\.android\ on Windows Vista and Windows 7, 8, and 10

Related resources

• https://developer.android.com/studio/publish/app-signing.html#debug-mode
• https://coderwall.com/p/r09hoq/android-generate-release-debug-keystores