test and review following PRs in image updater to support webhook:

• manifests(webhook): expose webhook feature
  https://github.com/argoproj-labs/argocd-image-updater/pull/1198
• feat(webhook): add webhook handler for quay.io and make improvements to the community PR https://github.com/argoproj-labs/argocd-image-updater/pull/1197 
• test(webhook): increase test coverage for server.go https://github.com/argoproj-labs/argocd-image-updater/pull/1194 
• feat: implement webhook receiver for Docker, GHCR and Harbor to receive triggers for image update https://github.com/argoproj-labs/argocd-image-updater/pull/1159