Add builds for macOS

[dwhjames]

Include darwin amd64 & arm64 in binary releases.

[dwhjames]

@microsoft-github-policy-service agree company="Gemini"

[ashort96]

@micromaomao sorry for the cold ping on this PR; is there a better way to have this PR reviewed? It would be great to have darwin native binaries rather than relying on only using these in docker.

[micromaomao]

lgtm, thanks!

[micromaomao]

can't merge due to conflict

[dwhjames]

@micromaomao thanks for your attention; the conflicts have been resolved.

[dwhjames]

@micromaomao

My goal here is to get binaries for macOS supported here

https://github.com/Azure/azure-cli-extensions/blob/main/src/confcom/azext_confcom/rootfs_proxy.py

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I see that you are also working on that codebase:

• {confcom}: Simplify logic in map_image_from_tar(_compatibility)?, new integrity-vhd Azure/azure-cli-extensions#9838
• [confcom]: Fix accidental docker dependency even when using tar Azure/azure-cli-extensions#9863
• [confcom]: Radius support Azure/azure-cli-extensions#9915

[Copilot]

Pull request overview

Adds macOS (darwin) cross-compiled binaries to the GitHub Actions release workflow so tagged releases include both amd64 and arm64 macOS executables alongside existing Linux and Windows artifacts.

Changes:

• Build darwin/amd64 and darwin/arm64 binaries in the release workflow (with CGO_ENABLED=0).
• Upload the new macOS binaries as workflow artifacts.
• Attach the macOS binaries to the draft GitHub release assets.

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