update-changelog.yml

name: Update Changelog

on:
  push:
    tags:
      - 'v*'

permissions:
  contents: write
  pull-requests: write

jobs:
  tag-check:
    runs-on: ubuntu-latest
    steps:
      - name: Validate stable release tag
        id: check-tag
        run: |
          set -euo pipefail
          echo "Tag validation"
          [[ "${GITHUB_REF_NAME}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]] \
          || { echo "Tag '${GITHUB_REF_NAME}' doesn't match expected format"; exit 1; }

  update-changelog:
    needs: tag-check
    runs-on: ubuntu-latest
    steps:
      - name: Checkout main
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          ref: main
          fetch-depth: 0

      - name: Find previous release tag
        id: prev-tag
        run: |
          git fetch --tags --force
          CURRENT_TAG="${{ github.ref_name }}"
          PREV_TAG=$(git tag -l 'v*' | grep -v -E '(prerelease|test|hotfix)' | sort -V | grep -B1 "^${CURRENT_TAG}$" | head -1)
          if [ -z "$PREV_TAG" ]; then
            PREV_TAG=$(git tag -l 'v*' | grep -v -E '(prerelease|test|hotfix)' | sort -V | tail -1)
          fi
          echo "Auto-detected previous tag: $PREV_TAG"
          echo "prev_tag=$PREV_TAG" >> "$GITHUB_OUTPUT"

      - name: Check if there are commits between tags
        id: check-commits
        run: |
          COUNT=$(git rev-list --count "${{ steps.prev-tag.outputs.prev_tag }}..${{ github.ref_name }}" || echo "0")
          echo "commit_count=$COUNT" >> "$GITHUB_OUTPUT"
          echo "Found $COUNT commit(s) between ${{ steps.prev-tag.outputs.prev_tag }} and ${{ github.ref_name }}"

      - name: Version without leading v
        run: echo "RELEASE_VERSION=${GITHUB_REF_NAME#v}" >> "$GITHUB_ENV"

      - name: Generate changelog
        if: steps.check-commits.outputs.commit_count != '0'
        uses: orhun/git-cliff-action@f50e11560dce63f7c33227798f90b924471a88b5 # v4.8.0
        id: git-cliff
        with:
          config: cliff.toml
          args: --verbose ${{ steps.prev-tag.outputs.prev_tag }}..${{ github.ref_name }} --tag ${{ env.RELEASE_VERSION }} --prepend CHANGELOG.md

      - name: Create PR with changelog
        if: steps.check-commits.outputs.commit_count != '0'
        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          branch: changelog-${{ github.ref_name }}
          base: main
          title: "OCM-00000 | chore: add changelog for ${{ github.ref_name }}"
          body: |
            ## Changelog for ${{ github.ref_name }}

            Auto-generated changelog entry for release ${{ github.ref_name }}.

            **Release tag**: `${{ github.ref_name }}`
            **Previous tag**: `${{ steps.prev-tag.outputs.prev_tag }}`

            Auto-generated by GitHub Actions.
          commit-message: |
            OCM-00000 | chore: add changelog for ${{ github.ref_name }}

            Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
          labels: changelog
          delete-branch: true
          add-paths: "CHANGELOG.md"
          sign-commits: true