[ci] Enabled changelog bot from openwisp-utils

[pushpitkamboj]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Description of Changes

Added a changelog bot workflow to automatically update changelogs when PRs are approved.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

This PR adds two GitHub Actions workflow files to enable an automated changelog bot from openwisp-utils.

Workflow Analysis

bot-changelog-trigger.yml: Triggers on PR review submission, checks if the PR title starts with [feature], [fix], or [change], and uploads PR metadata as an artifact if conditions are met.

bot-changelog-runner.yml: Listens for completion of the trigger workflow, downloads the metadata artifact, and invokes the reusable changelog workflow from openwisp-utils.

Security Considerations

✅ The trigger workflow validates PR numbers with regex ^[0-9]+$ before processing
✅ Only runs for approved reviews from OWNER, MEMBER, or COLLABORATOR
✅ Uses minimal permissions (actions: read at workflow level)
✅ No secrets are logged or exposed

Files Reviewed (2 files)

• .github/workflows/bot-changelog-runner.yml
• .github/workflows/bot-changelog-trigger.yml

---

_{Reviewed by kimi-k2.5 · 80,088 tokens}