cachix VS servant-benchmark

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I've been trying to gradually introduce Nix more into my development.[0]

One roadblock I haven't been able to overcome is integrating Nix in CI. In my case, I use CircleCI. I know there are Nix-centric CI platforms, but I've invested a lot into CircleCI and would like to stay.

The problem I hit is that if I switch from something like a sqlfluff Docker container to a Nix Docker container, my build job goes from 15s to 2m+ because now I have to download several gigs within the CI job and build my Nix environment from scratch.[1]

I tried Cachix, but the best I could get was bringing the job down to 55s (a roughly 3x performance penalty from an off-the-shelf Docker container).[2]

How does FlakeHub Cache's performance in CI compare to the default Nux cache or to Cachix?

[0] https://mtlynch.io/notes/nix-dev-environment/

[1] https://github.com/cachix/cachix/issues/579

[2] https://github.com/cachix/cachix/issues/579#issuecomment-175...

This is an initial release and I would really appreciate any feedback, especially for missing Servant API combinators or benchmarking tools that you'd like featured. Issues and PRs are more than welcome in the project's repository.