release_drafter.yaml

name: Check for new chart release

# Description:
# This workflow prepares a new release of the helm chart by updating chart and app versions as well as creating a PR.
# A release PR will be created in these cases.
#  - When a user kicks offs this workflow manually. A user can specify the CHART_VERSION and APP_VERSION used for the new release.
#  - When the cron schedule kicks off the job and there is a version difference for the collector application, then a chart release draft PR will be created with the version automatically incremented appropriately.

on:
  schedule:
    # Run every 12 hours at 55 minutes past the hour.
    - cron: "55 */12 * * *"
  workflow_dispatch:
    inputs:
      CHART_VERSION:
        description: 'Optionally overrides the chart version in Chart.yaml.'
        required: false
        default: ''
      APP_VERSION:
        description: 'Optionally overrides the app version in Chart.yaml.'
        required: false
        default: ''
      DEBUG:
        description: 'Enable debug mode for the script.'
        required: false
        default: 'false'

jobs:
  prepare_release:
    runs-on: ubuntu-latest
    env:
      CHART_VERSION: ${{ github.event.inputs.CHART_VERSION }}
      APP_VERSION: ${{ github.event.inputs.APP_VERSION }}
      DEBUG: ${{ github.event.inputs.DEBUG }}
    steps:
      - uses: actions/checkout@v4

      - name: Install tools
        run: make install-tools

      - name: Prepare Release
        id: prepare_release
        run: |
          make prepare-release CHART_VERSION=$CHART_VERSION APP_VERSION=$APP_VERSION CREATE_BRANCH=false DEBUG=$DEBUG

      - name: Check if PR is already open
        id: check_if_pr_open
        run: |
          echo "PR_NEEDED=1" >> "$GITHUB_OUTPUT"
          git fetch origin
          # Directly check if the feature branch exists and has the same changes in the remote repository
          if git ls-remote --heads origin update-release > /dev/null; then
            if git diff --no-ext-diff --quiet origin/update-release -- helm-charts; then
              echo "PR_NEEDED=0" >> "$GITHUB_OUTPUT"
            fi
          fi

      - name: Open PR for Version Update
        id: open_pr
        if: ${{ steps.prepare_release.outputs.NEED_UPDATE == 1 && steps.check_if_pr_open.outputs.PR_NEEDED == 1 }}
        uses: peter-evans/create-pull-request@v6
        with:
          commit-message: Prepare release v${{ steps.prepare_release.outputs.LATEST_CHART_VERSION }}
          title: Prepare release v${{ steps.prepare_release.outputs.LATEST_CHART_VERSION }}
          body: |
            Description
            - Release Helm chart version ${{ steps.prepare_release.outputs.LATEST_CHART_VERSION }}
            - Includes collector version ${{ steps.prepare_release.outputs.LATEST_APP_VERSION }}
          branch: update-release
          base: main
          delete-branch: true