image: nixos/unstable
sources:
  - https://git.alanpearce.eu/nix-packages
environment:
  NIX_CONFIG: "experimental-features = nix-command flakes"
repositories:
  nixpkgs: https://nixos.org/channels/nixpkgs-unstable
tasks:
  - nixpkgs: |
      nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'

  - build: |
      nix shell -f '<nixpkgs>' nix-build-uncached -c nix-build-uncached nix-packages/ci.nix -A cacheOutputs