fix(arm-build): added the arm64 builds to CI pipeline

[krishna9358]

Summary

• Added QEMU setup (line 32-33) - Required for cross-platform emulation when building ARM64 images on AMD64 runners
• Added platforms to all three image builds

Testing

• bun run test
• bun run lint
• bun run typecheck
• Additional notes:

Documentation

• Updated the relevant doc(s) (see docs/guide.md) or checked that no updates are needed.
• Recorded contract/architecture changes in both public docs and .ai logs when applicable.

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