🔍 Research: Complete builder backend comparison matrix

[kingdonb]

🎯 Objective

Complete the builder backend comparison matrix in BUILDER_BACKENDS.md to help developers choose the optimal build tool for their projects.

📋 Current State

The document exists as a stub with TODO sections that need research:

• Performance benchmarks (Ko vs Kaniko build times)
• Security audit comparisons
• Image size differences
• BuildKit optimization guides

🔧 Deliverables

1. Complete Performance Research

• Ko vs Kaniko build time comparisons for Go applications
• Image size differences (Ko distroless vs Kaniko standard)
• BuildKit caching performance with different configurations
• Spin WASM module size vs container image comparisons

2. Security Analysis

• Kaniko security audit results and rootless execution benefits
• BuildKit security modes (rootless vs privileged) comparison
• Spin capability-based security model documentation
• Ko distroless image security benefits

3. Use Case Guidelines

• Decision matrix: "When to use which backend"
• Real-world examples for each backend type
• Migration guidance between backends
• Performance optimization tips per backend

4. Technical Documentation

• Configuration examples for each backend
• Integration patterns with hephy-builder
• Troubleshooting guides for common issues

📊 Research Sources

Ko Research

• Ko documentation
• Ko vs Docker benchmarks
• Real-world Go application builds

Kaniko Research

• Kaniko security analysis
• Performance benchmarks vs Docker builds
• Rootless execution security benefits

BuildKit Research

• BuildKit advanced features documentation
• Security modes and rootless execution
• Cache optimization patterns

Spin Research

• Spin framework documentation
• WebAssembly performance characteristics
• SpinKube integration patterns

🎯 Success Criteria

• Complete BUILDER_BACKENDS.md with no TODO sections
• Actionable decision guide for backend selection
• Performance data with real-world examples
• Security comparison with specific recommendations

🔗 Related Work

This supports:

• Issue Epic: Transform to hephy-builder with multi-platform CI support #10: hephy-builder transformation
• Issue Add Spin (WebAssembly) build backend support #11: Spin backend implementation
• Issue Add Ko build backend for optimized Go application builds #12: Ko backend implementation
• docs/README.md navigation structure

💡 Implementation Notes

This is a research task perfect for:

• New contributors wanting to understand the ecosystem
• Performance engineers interested in build optimization
• Security-focused developers evaluating tool chains
• Technical writers improving documentation

The research can be done incrementally - each backend can be completed independently.