When the user configures the install-config.yaml additionalTrustBundle field (for example, in a disconnected installation using a local registry),
the user-ca-bundle configmap gets populated with more content than strictly required

Always

    1. Setup a local registry and mirror the content of an ocp release
    2. Configure the install-config.yaml for a mirrored installation. In particular, configure the additionalTrustBundle field with the registry cert
    3. Create the agent ISO, boot the nodes and wait for the installation to complete
    

    The user-ca-bundle cm does not contain onyl the registry cert

user-ca-bundle configmap with just the content of the install-config additionalTrustBundle field