Simplify and update CI scripts

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• d25a5259 - use cachix

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• 449f80a5 - Fix

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• 7d6c9d46 - fix

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• 569d4227 - fix

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I think a way of running the entire job in the context of a nix shell is to overwrite the docker image entrypoint. See this config option https://docs.gitlab.com/ee/ci/yaml/#imageentrypoint

I've done something like this in the past. I think you do something like:

build:
  image: 
    name: nixos/nix
    entrypoint: ["nix-shell", "shell.nix"]
  script:
    - ...

Actually a way that's a bit less hacky is to do something like:

script:
  - source <( nix print-dev-env -f shell.nix )
  ...