Fix broken legacy pipeline - explicitly install XCODE 26.0

[vicocz]

/Users/runner/.dotnet/packs/Microsoft.iOS.Sdk.net9.0_26.0/26.0.9783/targets/Xamarin.Shared.Sdk.targets(2346,3): error : This version of .NET for iOS (26.0.9783) requires Xcode 26.0. The current version of Xcode is 26.2. Either install Xcode 26.0, or use a different version of .NET for iOS. See https://aka.ms/xcode-requirement for more information. [/Users/runner/work/brickcontroller2/brickcontroller2/BrickController2/BrickController2.iOS/BrickController2.iOS.csproj::TargetFramework=net9.0-iOS]

[Copilot]

Pull request overview

This PR fixes a build failure in the iOS pipeline caused by a version mismatch between the .NET iOS SDK (which requires Xcode 26.0) and the installed Xcode version (26.2). The fix explicitly sets Xcode 26.0 for the build process.

Changes:

• Added environment variables for Xcode version and target framework
• Modified MAUI workload installation to explicitly include iOS
• Added steps to select and verify the specific Xcode version

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.