gptchangelog.yml: Notify Sync PR fails when SLACK_WEBHOOK_URL is not configured

[bedatty]

Bug

The Notify Sync PR job in gptchangelog.yml fails when the SLACK_WEBHOOK_URL secret is not configured in the calling repository.

Error

SLACK_WEBHOOK_URL: 
Error: Need to provide at least one botToken or webhookUrl

Workflow run: https://github.com/LerianStudio/console-sdk/actions/runs/23544924759/job/68542780018

Expected behavior

The job should check if SLACK_WEBHOOK_URL is set before calling slackapi/slack-github-action. If not configured, it should log a warning and exit 0 instead of failing the job.

Suggested fix

Add a guard step before the Slack notification:

- name: Check if Slack webhook is configured
  id: check-slack
  run: |
    if [ -z "${{ secrets.SLACK_WEBHOOK_URL }}" ]; then
      echo "skip=true" >> $GITHUB_OUTPUT
      echo "⚠️ SLACK_WEBHOOK_URL not configured, skipping notification"
    fi

- name: Send Slack notification
  if: steps.check-slack.outputs.skip != 'true'
  uses: slackapi/slack-github-action@v1.24.0
  ...

Context

Repository console-sdk uses gptchangelog.yml@v1.18.1 with secrets: inherit. The SLACK_WEBHOOK_URL secret is not yet configured, causing the changelog pipeline to fail on an optional notification step.