name: "Build NixOS manual"

permissions: read-all

on:
  pull_request_target:
    branches:
      - master
    paths:
      - 'nixos/**'

jobs:
  nixos:
    runs-on: ubuntu-latest
    if: github.repository_owner == 'NixOS'
    steps:
      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
        with:
          # pull_request_target checks out the base branch by default
          ref: refs/pull/${{ github.event.pull_request.number }}/merge
      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
        with:
          # explicitly enable sandbox
          extra_nix_config: sandbox = true
      - uses: cachix/cachix-action@ad2ddac53f961de1989924296a1f236fcfbaa4fc # v15
        with:
          # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
          name: nixpkgs-ci
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
      - name: Building NixOS manual
        run: NIX_PATH=nixpkgs=$(pwd) nix-build --option restrict-eval true nixos/release.nix -A manual.x86_64-linux