Integrate build of ios app / build and publish on S3

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enhance codepipeline to build ios app following this guide
https://docs.flutter.dev/deployment/ios

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As CodeBuild does not offer macOS build images, we will need to use an external service, e.g.
https://codemagic.io/build-ios-without-mac/
or Azure DevOps https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops&tabs=yaml#xcode

https://blog.codemagic.io/how-to-build-and-distribute-ios-apps-without-mac-with-flutter-codemagic/

https://www.bitrise.io/pricing#Comparison-Section

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https://docs.fastlane.tools/

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https://blog.codemagic.io/cicd-with-flutter-and-aws/

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https://d1.awsstatic.com/architecture-diagrams/ArchitectureDiagrams/ios-cicd-build-test-pipeline-ra.pdf?did=wp_card&trk=wp_card

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https://appcircle.io/blog/guide-to-automated-mobile-ci-cd-for-flutter-projects-with-appcircle/