Ship the platform workerd binary in the self-host Docker runtime#1394
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The workerd npm package's bin/workerd is a Node shim that execs the real binary from the per-platform optional dependency (@cloudflare/workerd-<os>-<arch>), which package-runtime.ts never copied into the image. Custom app tools failed to sync or invoke with 'workerd is unavailable on this platform'. Copy the platform package alongside the shim, derived per build platform like the libsql native addon.
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Found by running the selfhost-docker e2e suite against the published v1.5.31 image: custom app tools fail to sync or invoke with "workerd is unavailable on this platform". The image ships the workerd npm package, but its bin/workerd is a Node shim that execs the real binary from the per-platform optional dependency, which the runtime packaging never copied. Copy it alongside the shim, derived per build platform the same way as the libsql native addon.