Releases certify the UBI images through redhat-certify.yml, which only
lists the client, proxy and combined server, so a released relay UBI
image would never reach the Red Hat catalog.
Add relay to the component list and the manual dispatch options. Its
Partner Connect ID comes from REDHAT_CERT_ID_RELAY, which must exist
before this merges: the resolve step fails the whole run when any
component's variable is missing.