suggest-cron-pr.yml

# Auto-PR: shift a workflow's schedule to the grid's cleanest hour
#
# Runs weekly, finds the cleanest hour for your zone (from accumulated history,
# else forecast, else heuristic), and opens a PR moving the target workflow's
# daily cron to that hour. You review and merge — the saving then applies to
# every future run, with no idle waiting.
#
# Only simple daily crons are rewritten; cadence and minute are preserved.
#
# Copy to .github/workflows/carbon-suggest-cron.yml

name: Carbon-Aware Schedule Suggestion

on:
  schedule:
    - cron: "0 9 * * 1" # Mondays 09:00 UTC
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  suggest:
    runs-on: ubuntu-latest
    steps:
      - uses: peterklingelhofer/carbon-aware-dispatcher@v1
        with:
          mode: "suggest"
          grid_zones: "GB"
          suggest_target: ".github/workflows/nightly-batch.yml"
          github_token: ${{ secrets.GITHUB_TOKEN }}
          # Optional: feed the accumulating curve from a ledger so non-GB zones
          # build a profile over time.
          # ledger: 'gist:${{ vars.CARBON_LEDGER_GIST }}'
          # gist_token: ${{ secrets.GIST_TOKEN }}