auto-tag.yml

name: Auto-Tag on Release Merge

on:
  pull_request:
    types: [closed]
    branches:
      - master
      - main

permissions:
  contents: write

jobs:
  create-tag:
    # Only run when a release/* branch was actually merged (not just closed)
    if: >
      github.event.pull_request.merged == true &&
      startsWith(github.event.pull_request.head.ref, 'release/')
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.PAT_TOKEN }}

      - name: Extract version from branch name
        id: version
        run: |
          BRANCH="${{ github.event.pull_request.head.ref }}"
          VERSION="${BRANCH#release/}"
          VERSION="${VERSION#v}" 
          echo "VERSION=$VERSION" >> "$GITHUB_OUTPUT"
          echo "TAG=v${VERSION}" >> "$GITHUB_OUTPUT"
          echo "Detected version: $VERSION (tag: v${VERSION})"

      - name: Check if tag already exists
        id: check
        run: |
          if git rev-parse "refs/tags/${{ steps.version.outputs.TAG }}" >/dev/null 2>&1; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
            echo "Tag ${{ steps.version.outputs.TAG }} already exists, skipping."
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Create and push tag
        if: steps.check.outputs.exists == 'false'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag -a "${{ steps.version.outputs.TAG }}" -m "Release ${{ steps.version.outputs.VERSION }}"
          git push origin "${{ steps.version.outputs.TAG }}"