Add Dockerfile for building vfkit binaries

[vyasgun]

Summary by CodeRabbit

• Chores
  • Enhanced build infrastructure with multi-stage Docker support, enabling compilation and distribution of optimized binaries for both Intel and Apple Silicon macOS architectures. Users can now benefit from architecture-specific optimizations on their respective Mac systems.

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Walkthrough

A multi-stage Dockerfile is introduced that builds vfkit binaries for two architectures (amd64 and arm64) on macOS. Stage 1 compiles the binaries using a UBI Go toolset image, and Stage 2 packages them into a final scratch image containing both architecture-specific artifacts.

Changes

Cohort / File(s)	Summary
Multi-stage Build Configuration Dockerfile	Introduces multi-stage Dockerfile with Stage 1 compiling vfkit for Darwin amd64 and arm64 architectures using UBI Go toolset (CGO_ENABLED=1, -buildvcs=false), and Stage 2 creating a scratch image containing both compiled binaries at /releases/vfkit-amd64 and /releases/vfkit-arm64

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A Dockerfile hops into view,
Multi-stage magic, shiny and new!
Two architectures, both strong and fleet—
amd64 and arm64 in binary beat! 🏗️

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📥 Commits

Reviewing files that changed from the base of the PR and between 81c57fb and 5f4211c.

📒 Files selected for processing (1)

• Dockerfile

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