Description of problem:

When using disconnected installation (supported for vSphere or OpenStack) for cluster deployment, the pull secret is included in the install-config.yaml but it is not properly quoted. This leads to errors like "Malformed inline string" being shown in the YAML editor. Or, if you proceed to deployment, the Hive log may contain a message like:

could not unmarshal InstallConfig: error unmarshaling JSON: while decoding JSON: json: cannot unmarshal object into Go struct field InstallConfig.pullSecret of type string

Version-Release number of selected component (if applicable):

All past MCE versions

How reproducible:

Always

Steps to Reproduce:

1. Create a credential for vSphere or OpenStack, optionally with disconnected installation information.
2. Attempt to deploy a cluster using the credential, adding disconnected intallation information if you did not save them in the credential.

Additional info:

See Slack thread:
https://redhat-internal.slack.com/archives/CTDEY6EEA/p1712081898047209