name: Update flake.lock
on:
  workflow_dispatch: # allows manual triggering
  schedule:
    - cron: '0 0 * * 0'

jobs:
  lockfile:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
      - name: Install Nix
        uses: cachix/install-nix-action@v16
      - name: Get current date
        id: date
        run: echo "::set-output name=date::$(date +'%Y%m%d')"
      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@v13
        with:
          pr-title: "Updates ${{ steps.date.outputs.date }}"
          branch: "updates-${{ steps.date.outputs.date }}"