Docker + nix + gitlab ci: cache /nix/store per-machine

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I ended up using https://cachix.org/ for caching. The setup is basically:

$ cat .gitlab-ci.yml
image: nixos/nix:latest

before_script:
  - nix-env -iA nixpkgs.cachix
  - cachix use insertyourcachixnamehere

build:
  stage: build
  script:
    - nix-build

Before I push build on CI, I do nix-build | cachix push insertyourcachixnamehere on my dev machine. It uploads store paths to my personal cache, and CI downloads them instead of rebuilding them. I could cut down the pipeline time from 30 minutes to 3 that way.

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