Duo Workflow: Convert to GitLab CI

CI/CD Pipeline Modernization

Issue Reference

Closes #32

What does this MR do and why?

This merge request converts and modernizes the CI/CD pipeline configuration to leverage GitLab CI best practices and GitLab Duo Workflow capabilities.

Changes Made

• ✅ Updated .gitlab-ci.yml to modern GitLab CI format
• ✅ Implemented GitLab Duo Workflow compatibility
• ✅ Optimized pipeline stages and job dependencies
• ✅ Improved component-based configuration
• ✅ Enhanced artifact management and caching

Benefits

• Better Maintainability: Cleaner, more organized pipeline configuration
• Improved Performance: Optimized job execution and caching strategies
• GitLab Duo Integration: Full compatibility with GitLab Duo Workflow features
• Modern Patterns: Follows latest GitLab CI/CD best practices

How to set up and validate locally

1. Review the updated .gitlab-ci.yml configuration
2. Verify all pipeline stages are defined correctly
3. Check job dependencies and artifact flow
4. Ensure security scanning components are properly configured
5. Test pipeline execution in a merge request

Testing

• All pipeline jobs execute successfully
• Security scanning stages function correctly
• Artifacts are generated and accessible
• Pipeline performance is improved
• No regression in functionality