Convert rover features as golang executable

[arnaudlh]

Description

Convert the rover from a Docker container-based solution to a Golang executable. This will improve performance, reduce resource overhead, and provide a more lightweight deployment option for the Terraform platform engineering toolset.

Current State

The rover is currently implemented as a Docker container with:

• 88% Shell scripts
• 8.3% Dockerfile
• 2% Python
• 1.5% HCL
• 0.2% Makefile

Benefits of Migration to Go

• Performance: Faster execution and lower memory footprint
• Portability: Single binary distribution across platforms
• Reduced dependencies: No Docker runtime requirement
• Simplified deployment: Direct executable without container orchestration
• Better resource utilization: Lower overhead compared to containerized solution
• Cross-platform support: Native binaries for different OS/architectures

Migration Tasks

• Analyze current shell script functionality and map to Go modules
• Design Go application architecture and CLI interface
• Implement core Terraform deployment logic in Go
• Port configuration management features
• Implement Azure-specific platform engineering features
• Add comprehensive testing suite
• Create build pipeline for multi-platform binaries
• Update documentation and usage examples
• Provide migration guide for existing users
• Maintain backward compatibility during transition

Technical Considerations

• CLI Framework: Consider using cobra/viper for command-line interface
• Configuration: Migrate existing configuration formats
• Azure SDK: Leverage Azure SDK for Go
• Terraform Integration: Use Terraform Go SDK or exec approach
• Logging: Implement structured logging
• Error Handling: Robust error handling and user feedback

Acceptance Criteria

• Go executable provides equivalent functionality to current Docker solution
• Performance benchmarks show improvement over container version
• Cross-platform binaries available (Linux, macOS, Windows)
• Comprehensive test coverage
• Updated documentation
• Migration path documented for existing users

Additional Context

This migration represents a significant architectural change that will modernize the rover toolset and align with current Go ecosystem practices for infrastructure tooling.

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Review Note (2026-01-12): Current branch shows migration to Rust (001-shell-to-rust-migration) rather than Go. This issue should be updated to reflect the actual migration strategy or closed if Rust is the chosen path.