Add --no-codesign flag to ios_additional_params input by default.
The actual codesigning will be done by the Xcode Archive step after the flutter-build, so codesigning is not necessary in this phase.
AAB support - Thanks koral– 
Now you can build Android App Bundle ( .aab ) with the step by selecting appbundle for the android_output_type input.
New inputs
-
android_output_type: The selected output type will be build, either APK or app bundle (AAB) -
android_bundle_output_pattern: Pattern to find built AAB artifacts relative to $BITRISE_SOURCE_DIR
New outputs:
-
BITRISE_AAB_PATH_LIST: List of the generated (and copied) AAB file paths - after filtering. -
BITRISE_AAB_PATH: Path of the generated (and copied) AAB file - after filtering.