muse is now the front door of a public project, and it was the only image in that stack without an arm64 build. Raspberry Pis, arm64 NASes and Ampere VPSes are a large share of self-hosters, so amd64-only made the whole stack un-runnable for them — gluetun, slskd, soularr, lidarr, navidrome and the socket proxy all already publish both. Three parts, because changing `platforms:` alone would have failed: - setup-qemu-action registers the binfmt handlers buildx needs to produce arm64 on an amd64 runner. Without it the build errors with "exec format error"; it does not quietly fall back to amd64. - The web stage is pinned to --platform=$BUILDPLATFORM so the Next.js build runs natively once instead of being emulated per platform. It is the expensive step, and its output is static HTML/JS/CSS with no native code, so the bytes are identical either way. This is what makes the old comment's "3-5x slower for nothing" no longer true. - platforms: linux/amd64,linux/arm64. Verified locally before pushing: both platforms build in ~52s, and the loaded arm64 image reports aarch64 with uvloop, watchfiles, httptools and pydantic_core all importing, `import app` succeeding, and the static UI present. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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