build.sh runs npm run build on macOS, so only the host's sharp binary (darwin-arm64) got traced into the standalone output. The container runs node:20-alpine (Linux, musl libc), which cannot load that binary - the server crashed at runtime, causing a 502 even though the docker build itself succeeded. npm pack can fetch another platform's prebuilt sharp/libvips tarballs without an install-time OS check, so build.sh now pulls the linux-musl x64 and arm64 builds directly into build/node_modules and drops the now-unused host binary.
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