CircleCI

1. Create new binary cache on https://app.cachix.org/cache and generate a write auth token.
2. Follow circleci documentation to setup environment variable to set $CACHIX_AUTH_TOKEN.
3. Replace mycache in the following .circleci/config.yml:

version: 2.1

workflows:
  version: 2
  workflow:
    jobs:
      - build

jobs:
  build:
    docker:
      - image: nixos/nix:2.24.10
        environment:
          CACHIX_NAME: mycache
    steps:
      - checkout
      - run:
          name: Set up Cachix
          command: |
            nix-env -iA nixpkgs.cachix
            cachix use $CACHIX_NAME
      - run: cachix watch-exec $CACHIX_NAME nix-build
      - run: cachix watch-exec $CACHIX_NAME -- nix-shell --run "echo nix-shell successfully entered"