name: Update flake.lock

on:
  schedule:
    - cron: "0 6 * * 1"
  workflow_dispatch:

jobs:
  update-flake-lock:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v19

      - name: Update and commit flake.lock
        run: |
          set -euo pipefail
          nix --extra-experimental-features 'nix-command flakes' flake update

          if git diff --quiet -- flake.lock; then
            echo "No flake.lock changes detected"
            exit 0
          fi

          git config user.name "gitea-actions"
          git config user.email "gitea-actions@nix-cache.local"
          git add flake.lock
          git commit -m "chore: update flake.lock"
          git push