Based on spec in openstack-helm repo,
support-OCI-image-registry-with-authentication-turned-on.rst
Each Helm chart can configure an OCI image registry and
credentials to use. A Kubernetes secret is then created with these
info. Service Accounts then specify an imagePullSecret specifying
the Secret with creds for the registry. Then any pod using one
of these ServiceAccounts may pull images from an authenticated
container registry.
Change-Id: Iebda4c7a861aa13db921328776b20c14ba346269
f31cfb2ef9