name: Promote dev to main (prod)

permissions:
  contents: write

on:
  schedule:
    - cron: "0 8 * * *"
  workflow_dispatch:

concurrency:
  group: promote-dev-to-main
  cancel-in-progress: false

jobs:
  promote:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          ref: dev
          fetch-depth: 0
      - name: Fast-forward main (PROD) to dev
        # main is the production branch; a plain ref push is fast-forward-only
        # (branch protection rejects non-FF), so a diverged main fails loudly.
        run: |
          git push origin HEAD:refs/heads/main