GHC 9.0.1-alpha1 Source Distribution tarball missing Hadrian scripts

Hello, I have downloaded this file: https://downloads.haskell.org/ghc/9.0.1-alpha1/ghc-9.0.0.20200925-src.tar.xz

It appears that that it is missing the hadrian directory so it is not possible to build it using hadrian.

This issue is a re-raise of #17980 (closed). I was hoping that GHC 9.0 would be able to build using hadrian (to get relocatable builds) using the regular official source tarball (without having to mess with git).

Thank you

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