$ oc get ns
TLS certificates for registry or HTTPS endpoints must be added to a config map to import data from these sources. This config map must be present in the namespace of the destination data volume.
Create the config map by referencing the relative file path for the TLS certificate.
Ensure you are in the correct namespace. The config map can only be referenced by data volumes if it is in the same namespace.
$ oc get ns
Create the config map:
$ oc create configmap <configmap-name> --from-file=</path/to/file/ca.pem>