elm2nix VS cachix

Hello r/elm! I have been working on a new way to package Elm applications with Nix. As far as I am aware, the current way to build Elm applications with Nix is to use elm2nix. While this works, it does require the user to manually regenerate certain nix files when updating your project's elm.json, and to commit a binary file used in the build process. I have made mkElmDerivation as a way to get around these two issues and simplify the build process.

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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...