Disable Cachix pushes (#3312)
* Disable Cachix pushes
This is not safe until we have sandboxed builds. For TGI alone
this might not be a huge issue, but with Cachix caching disabled
in hf-nix, TGI CI would build all the packages and push it to
our cache.
* fix: bump docs
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Co-authored-by: drbh <david.richard.holtz@gmail.com>
