name: "Build"
on:
  pull_request:
  push:

env:
  RUNNER_TOOL_CACHE: /toolcache

jobs:
  determine-hosts:
    name: "Determining hosts to build"
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    outputs:
      hosts: ${{ steps.hosts.outputs.hostnames }}
    steps:
      - uses: actions/checkout@v5
      - uses: https://github.com/cachix/install-nix-action@v31
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - name: "Determine hosts"
        id: hosts
        run: |
          hostnames="$(nix eval .#nixosConfigurations --apply builtins.attrNames --json)"
          printf "hostnames=%s\n" "${hostnames}" >> "${GITHUB_OUTPUT}"

  build:
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    needs: determine-hosts
    strategy:
      matrix:
        hostname: [
          Development
          Testing
        ]

    steps:
      - uses: actions/checkout@v5
      - uses: https://github.com/cachix/install-nix-action@v31
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - name: "Build host"
        run: |
          nix build ".#nixosConfigurations.${{ matrix.hostname }}.config.system.build.toplevel"