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How do image manifests ensure cross-architecture builds?

Senior Docker
Quick Answer Multi-arch images use an OCI image index (manifest list) รขโ‚ฌโ€ a top-level manifest that points to platform-specific manifests (linux/amd64, linux/arm64). When you pull an image, Docker matches your platform to the right manifest and downloads that architecture's layers. buildx with --platform builds for multiple architectures in one push.

Answer

Manifest lists map architectures; clients pull correct images automatically.
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