name: Update Nix Flake lock
on:
  workflow_dispatch: # allows manual triggering
  schedule:
    - cron: '0 0 1 * *' # first day of every month

jobs:
  update-nix-flake-lock:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Install Nix
        uses: cachix/install-nix-action@v20
        with:
          extra_nix_config: |
            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}

      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@v23
        with:
          pr-title: "Update flake.lock" # Title of PR to be created
          pr-labels: |                  # Labels to be set on the PR
            dependencies
            automated