Merge pull request #29901 from mboersma/update-image-builder-review-settings

image-builder: require explicit approvals

Author: k8s-ci-robot

config/prow/plugins.yaml

@@ -79,6 +79,7 @@ approve:
   - kubernetes-sigs/cluster-api-provider-azure
   - kubernetes-sigs/cluster-api-provider-vsphere
   - kubernetes-sigs/descheduler
+  - kubernetes-sigs/image-builder
   require_self_approval: true
   ignore_review_state: true
 - repos: