fastlane gym builds and packages iOS and macOS apps for you. It takes care of all the heavy lifting and makes it super easy to generate a signed ipa or app file. Gym is also public and opensource.
More info:
https://github.com/fastlane/fastlane/tree/master/gym#readme

Technical details:

• We would need to include fastlane ruby gem into the slave and ios machine
• Then fastlane can be used in pipelines to trigger builds manage screenshots etc.

Goal

• Investigate using fastlane in our pipelines and impact on our requirements

Example - https://github.com/odra/helloworld-android-gradle/tree/fastlane