Add "build android" command to Sharezone CLI

[nilsreichardt]

Adds the sz build android command to the Sharezone CLI. It's part of a sz deploy command that should come in the future.

Running sz build android --help

NilsMBP13M14:sz_repo_cli nils$ fvm dart run sz_repo_cli build android --help
Build the Sharezone Android app in release mode. Codemagic CLI tools must be installed.

Usage: pub global run sz_repo_cli build android [arguments]
-h, --help            Print this usage information.
-s, --stage           [stable (default), alpha]
    --output-type     The type of output type, either "appbundle" or "apk".
                      [appbundle (default), apk]
    --build-number    An identifier used as an internal version number.
                      Each build must have a unique identifier to differentiate it from previous builds.
                      It is used to determine whether one build is more recent than
                      another, with higher numbers indicating more recent build.
                      When none is specified, the value from pubspec.yaml is used.
    --flavor          The flavor to build for. At the moment only "prod" is supported.
                      [prod (default), dev]

Run "pub global run sz_repo_cli help" to see global options.

Running sz build android

NilsMBP13M14:sz_repo_cli nils$ fvm dart run sz_repo_cli build android
Starting fvm flutter build appbundle --target lib/main_prod.dart --flavor prod --release --dart-define DEVELOPMENT_STAGE=STABLE...
Waiting for exit code...

Building without sound null safety ⚠️
Dart 3 will only support sound null safety, see https://dart.dev/null-safety

Running Gradle task 'bundleProdRelease'...                      
Removed unused resources: Binary resource data reduced from 609KB to 550KB: Removed 9%
Running Gradle task 'bundleProdRelease'...                         30.2s
✓ Built build/app/outputs/bundle/prodRelease/app-prod-release.aab (43.5MB).
Got exit code 0...
Build finished 🎉 

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docs.page/sharezoneapp/sharezone-app~685

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[Jonas-Sander]

See comments, otherwise LGTM!! :)