[#268] [Android] Update android_deploy_production.yml to build and distribute release build

[luongvo]

• Close [Android] Update android_deploy_production.yml to build and distribute release build #268

What happened 👀

• Add Android proguard rules.
• Update README instruction to sign release build.
• Update workflows to build Android production release build.
• Update all CD workflow naming.

Insight 📝

• signing.properties is excluded by gitignore. To generate and copy it to the sample folder, we can rename it to signing.properties.sample, same as .env.sample.
• To make Android release build with Flutter Config, we must add a proguard rule to keep BuildConfig https://github.com/ByneappLLC/flutter_config/blob/master/doc/ANDROID.md#android-setup.

Proof Of Work 📹

• The sample project can build and run Android production release build successfully.

flutter run --flavor production --release
Using hardware rendering with device sdk gphone64 arm64. If you notice graphics artifacts, consider enabling software rendering with "--enable-software-rendering".
Launching lib/main.dart on sdk gphone64 arm64 in release mode...
Reading env from: .env
Reading env from: .env
Reading env from: .env.staging
Reading env from: .env
Reading env from: .env.staging
Running Gradle task 'assembleProductionRelease'...                 27.8s
✓  Built build/app/outputs/flutter-apk/app-production-release.apk (16.3MB).
Installing build/app/outputs/flutter-apk/app-production-release.apk...        892ms

Flutter run key commands.
h List all available interactive commands.
c Clear the screen
q Quit (terminate the application on the device).
Application finished.

• The workflow has been updated to distribute Android production release build successfully https://github.com/nimblehq/flutter-templates/actions/runs/6635661882/job/18026951725

[manh-t]

LGTM