Deploy
Create an Upload Keystore
Follow the instructions here to create an upload keystore for your Android application.
Manually Release First Android App
I know, its sad. Unfortunately, not everything can be automated. If you try to use the Fastlane files to release the first version of your app, you will see this error:
This GitHub issue indicates that you only have to manually release a version of your app to the alpha track to start using Fastlane.
Included Scripts
The Flutter Fast boiler plate comes with convenient bash scripts for building and deploying your app using Fastlane. Run configurations have also been prebuilt for each of these scripts in Android Studio and VS Code.