There are some community issues and PRs related to supporting webhook in image-updater. Need to review them and think about how to best incorporate into the feature implementation.

• feat: implement webhook receiver for Docker, GHCR and Harbor to receive triggers for image update #1159

• WIP: add Webhook to reduce no. of registry scans required #284

• feat: Trigger image update check on incoming webhook and/or other triggers #1

• Allow webhooks for image update events from container registries #517