[flutter_release] Obfuscation support

[orkun1675]

Hello,

I'm trying to integrate with https://github.com/marketplace/actions/flutter-release-action.

We use the --obfuscate --split-debug-info=build/android/ flags when building our flutter appbundle and ipa. Does the flutter_release plugin support passing these flags?

Spefically the flow I'm trying to replicate is:

iOS

1. flutter build ipa --obfuscate --split-debug-info=build/ios/
2. Upload build/ios/ipa/$APP_NAME.ipa to Testflight

Android

1. flutter build appbundle --obfuscate --split-debug-info=build/android/
2. rm -rf build/app/intermediates/stripped_native_libs/release/stripReleaseDebugSymbols/out/lib/.crashlytics
3. cd build/app/intermediates/stripped_native_libs/release/stripReleaseDebugSymbols/out/lib/ && zip -r ../../../../../../outputs/bundle/release/symbols.zip . && cd -
4. firebase crashlytics:symbols:upload --app=$FIREBASE_APP_ID build/android/
5. Upload build/app/outputs/bundle/release/app-release.aab and build/app/outputs/bundle/release/symbols.zip to Google Play Console

[Gustl22]

One can pass any option like shown in the example
https://github.com/Oberhauser-Dev/dart_packages/blob/main/packages%2Fflutter_release%2FREADME.md#example

--build-arg=--obfuscate --build-arg=--split-debug-info=build/ios/

[Gustl22]

Custom workflows need to be evaluated, e.g. I never released a zip to play console.
I'm glad for any Pull requests, if a broader scope of functionality is required.