Dependencies

Downgrade flutter to a 1.x release (the following worked on an AUR install of flutter)

cd $(dirname $(readlink $(which flutter)))
git checkout 1.22.6
flutter doctor

Copy env.sh.example to env.sh and update your PATH variable to expose both flutter and go bin directories

export PATH="$PATH:/path/to/go/bin:/path/to/flutter/bin

Formatting

flutter format can be used to format the code in lib and test but it's default is 80 char line limit, it's 2020

Use:

flutter format lib/ test/ -l 120

Update version in pubspec.yaml to reflect this release, then

flutter build appbundle --no-shrink

This will create an android app bundle at build/app/outputs/bundle/release/

Upload the android bundle to the google play store https://play.google.com/apps/publish

In xcode, Release -> Archive then follow the directions to upload to the app store. If you have issues, https://flutter.dev/docs/deployment/ios#create-a-build-archive