Tests using --dart-define with Flutter and Shorebird.
To test with Flutter, run:
flutter run --dart-define=MY_VAR=HELLOTo test with shorebird, run:
shorebird init
shorebird release ios -- --dart-define=MY_VAR=HELLO
shorebird previewYou should see the same output in both cases (a white background with text reading "hello HELLO").