[feature] Add extensible CI/CD pipeline with multi-OS support

[Ghass-M]

🚀 Add Comprehensive CI/CD Pipeline for Pull Requests

Overview

This PR introduces a robust, extensible GitHub Actions workflow that validates pull requests across multiple operating systems and prepares the foundation for advanced code quality and security checks.

📋 What's Changed

✅ Implemented Features

• Multi-OS Build Matrix: Validates builds on Ubuntu, Windows, and macOS
• Comprehensive Testing: Unit tests with code coverage collection
• Dependency Checks: Automated scanning for vulnerable and deprecated packages
• Artifact Management: Test results and coverage reports preserved for review
• Build Optimization: Intelligent caching to reduce CI execution time

🎯 Key Benefits

• Cross-platform validation ensures compatibility across all target environments
• Early issue detection through automated security and dependency scanning
• Extensible architecture ready for future enhancements without workflow restructuring
• Developer feedback via comprehensive test reporting and artifact uploads
• Resource efficiency through intelligent job dependencies and caching

🔮 Future Ready

The pipeline is architected to easily accommodate:

• SonarCloud integration for advanced code quality metrics
• Performance benchmarking with BenchmarkDotNet
• Advanced security scanning with Snyk or similar tools
• Deployment workflows for staging/production environments

🧪 Testing

• Workflow validates YAML syntax
• Multi-OS build matrix executes successfully
• Test collection and artifact upload verified
• Dependency vulnerability checks functional

📊 Impact

• Improved code quality through automated validation
• Enhanced security posture via continuous scanning
• Reduced manual review time with automated checks
• Better cross-platform compatibility assurance

🎯 Checklist

• Workflow triggers on pull requests to master
• All jobs have proper dependencies and error handling
• Artifacts are uploaded with unique names per OS
• Security permissions configured correctly
• Environment variables centralized for easy maintenance
• Placeholder jobs ready for future enhancements

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Next Steps: Once merged, team can enable branch protection rules requiring these checks to pass before merging PRs.