CI/CD Optimization

[dogo]

Fixes issue #.

• This pull request follows the coding standards

This PR changes:

Optimizes the GitHub Actions workflow to improve build performance and maintainability.

Changes

• Ruby setup: Replaced mise-action with ruby/setup-ruby (faster, uses pre-compiled binaries)
• Multi-platform support: Updated Gemfile.lock to support both arm64-darwin-22 and x86_64-darwin-23
• Workflow simplification: Removed shell script, using xcodebuild directly with matrix strategy
• Output formatting: Switched from xcpretty to xcbeautify with GitHub Actions renderer
• Error handling: Added set -o pipefail to preserve exit codes

Benefits

• ⚡ Faster CI execution (Ruby install: ~5min → seconds)
• 🔧 Easier to maintain and extend
• 🎨 Better error/warning visibility in GitHub UI