container-structure-test | validate the structure of your container images | Continuous Deployment library

I've finally resolved this issue with the assistance of Google Cloud support team.

They found out a 403 Permission Denied error as the Cloud Build container trying to access Google Cloud Storage to delete a certain log object stored in the bucket, this error message is found at the back system of Cloud Build where users/clients have no access to. The 403 Permission Denied error is the result of the object retention policy applied to the bucket.

In my case, I've replaced retention policy with lifecycle policy to resolve this issue and it worked. We do this as we consider keeping Cloud Build log size under control is our primary objective and, to prevent any accidental deletion/modification to the log file, we ended up with setting read-only access to the resources in the log bucket except for the service account used by Cloud Build.