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The scratch base image has no /tmp directory, causing "No such file or directory" errors on write operations that use temp files. Create an empty /tmp with sticky bit in the builder and copy to runtime.
The scratch base image has no /tmp directory and no writable temp location. Set TMPDIR to /data which is owned by the tinycloud user and always exists.
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Set TMPDIR=/data in Dockerfile. Scratch has no /tmp and the tinycloud user can't write to root-owned directories.