fix: drop arm64 image build

[izolyte]

What

Build the Docker image for linux/amd64 only. Removes linux/arm64 from the buildx platforms list and drops setup-qemu-action.

Why

Cross-building arm64 under QEMU on the amd64 runner crashed pnpm install with qemu: uncaught target signal 4 (Illegal instruction) - core dumped, hanging every deploy. All DigitalOcean hosts are x86, so the arm64 image was never pulled.

amd64 now builds natively — no emulation, no crash.

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Review details

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 31588c1 and 68b1e9e.

📒 Files selected for processing (1)

• .github/workflows/cd.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/drop-arm64-build

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