name: CI

on:
  push:
    branches: [main]
    paths:
      - "**.nix"
      - "flake.lock"
      - ".github/workflows/ci.yaml"
  pull_request:
    paths:
      - "**.nix"
      - "flake.lock"
      - ".github/workflows/ci.yaml"
  workflow_call:
    inputs:
      ref:
        type: string
        description: "The branch, tag or SHA to checkout."
        required: false
  workflow_dispatch:

jobs:
  build:
    name: Build (${{ matrix.system }})

    strategy:
      matrix:
        include:
          - os: ubuntu-latest
            system: x86_64-linux

    runs-on: ${{ matrix.os }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      - name: Install Nix
        uses: cachix/install-nix-action@v30

      - name: Run build
        run: |
          nix flake check \
            --fallback \
            --keep-going \
            --print-build-logs \
            --show-trace