ci: drop arm64 QEMU build (2h → ~5 min)#11
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The previous matrix did linux/amd64,linux/arm64 with arm64 via docker/setup-qemu-action. QEMU-emulated builds of this image (Next.js SPA + Go cgo-sqlite) ran for ~2 hours per tag — fast enough to bottleneck every hotfix tag. Drop arm64. Cluster runners are amd64; Mac devs already run native arm64 under OrbStack with its own arm64 base story. If we ever need an arm64 multi-arch index, the right path is a second matrix entry on a native arm64 runner — not QEMU.
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QEMU-emulated arm64 build of this image (Next.js SPA + cgo-sqlite Go) was taking ~2h per tag. Drop arm64 from the matrix — cluster is amd64, Mac devs use OrbStack.