* feat: trigger VRT updates via /update-vrt comment
- Change vrt-update-generate.yml to trigger on issue_comment with /update-vrt
- Update VRT failure comment to inform users about the /update-vrt command
- Add step to fetch PR details since issue_comment events don't provide them
* fix: update VRT trigger condition to use startsWith for command detection
- Modify the condition in vrt-update-generate.yml to use startsWith instead of contains for the /update-vrt command in PR comments, ensuring more accurate command detection.