name: Label Sync

# Keeps repository labels in sync with the declarative source of truth
# (.github/labels.yml). Runs whenever that file changes on main, and can be
# triggered manually. Additive/update-only — never deletes labels.

on:
  push:
    branches: [main]
    paths:
      - ".github/labels.yml"
      - "scripts/sync_labels.py"
      - ".github/workflows/label-sync.yml"
  workflow_dispatch:

permissions:
  contents: read
  issues: write

concurrency:
  group: label-sync
  cancel-in-progress: false

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Install uv
        uses: astral-sh/setup-uv@v7

      - name: Sync labels
        run: uv run --with pyyaml python scripts/sync_labels.py
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GH_REPO: ${{ github.repository }}