Add GitHub Actions workflow to build iOS demos (by @NowSecure)

[cpholguera]

Automate iOS Demos Build with GitHub Actions

Summary

This PR introduces a GitHub Actions workflow to automate the build process for all iOS demo applications. The workflow dynamically discovers demo projects and generates unsigned .ipa files that can be downloaded and tested on jailbroken devices.

Key Features

• Automatic Discovery:

  • Finds all demo directories under demos/ios/ matching the pattern MASTG-DEMO-*.
  • Builds each demo separately using a dynamic matrix strategy.

• Build Process:

  • Installs necessary dependencies (ldid, cocoapods).
  • Replaces required project files (e.g., MastgTest.swift, Info.plist) from each demo.
  • Updates the iOS deployment target to 14.4 for compatibility.
  • Compiles the project with Xcode without code signing.
  • Manually packages the app into an .ipa file.

• Artifact Upload:

  • The generated IPA files are uploaded as workflow artifacts for easy downloading and testing.

Trigger Conditions

• The workflow is triggered when:
  • Changes are made to the demos/** directory.
  • A pull request is opened against the master branch.
  • It is manually triggered via the GitHub Actions UI.

Parallelization

• The build process supports parallel execution (up to 3 demos at a time), improving build efficiency.

How to Use

1. Add or modify iOS demo projects in the demos/ios/ directory.
2. Push changes to the repository or open a pull request.
3. Download the generated .ipa files from the GitHub Actions "Artifacts" section.