This script will download the ca.crt from the Cloud Native Container Registry Harbor and will create the necessary folder under /etc/docker/cert.d/ to let you login into Harbor via your local docker client.
I developed the script for the following post: https://rguske.github.io/post/using-harbor-with-the-vcenter-event-broker-appliance/
To solve this issue, I´ve created a little script which downloads the root certificate from Harbor, creates the relevant directories, puts the certificate into those and restarts the docker service.