https://kaedeee.com/flutter-codemagic-build_number/

I resolved the issue that CodeMagic didn't automatically update the build number of iOS building after I've deployed my Flutter code to GitHub.

How to Resolve

1. CodeMagic Setting

go to the tab,
build > build arguments

and type
--build-number=$(($BUILD_NUMBER))

1. Xcode Setting

At the Xcode > Info.plist,

check here.
key CFBundleShortVersionString
key CFBundleVersion

these both string to be $(FLUTTER_BUILD_NAME)

https://kaedeee.com/flutter-codemagic-build_number/