Remove tmp file from tarball job
Remove tmp file from tarball job

Brought up in
https://discourse.nixos.org/t/what-is-the-100mib-text-file-tmp-in-recent-channels-nixexprs-tar-xz/8137
and introduced by
https://github.com/NixOS/nixpkgs/commit/d6ec410a471a5f26fcaaf8f4f440b41fe3f13738.

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