Deploying disconnected OCP cluster with STS

Issue

• While deploying OpenShift with STS in a disconnected mode, the image-registry operator stucks in degraded state with the following error:

- apiVersion: config.openshift.io/v1
  kind: ClusterOperator
  metadata:
    ...
    name: image-registry
  spec: {}
  status:
    conditions:
    ...
    - lastTransitionTime: "2022-01-28T09:22:24Z"
      message: |-
        Progressing: Unable to apply resources: unable to sync storage configuration: WebIdentityErr: failed to retrieve credentials
        Progressing: caused by: RequestError: send request failed
        Progressing: caused by: Post "https://sts.amazonaws.com/": dial tcp x.x.x.x:443: i/o timeout
      reason: Error
      status: "True"

• During a disconnected OpenShift deployment, the installer fails to validate the custom endpoint for STS:

 Install Config": platform.aws.serviceEndpoints[0].url: Invalid value: "https://sts.eu-region-x.amazonaws.com": dial tcp x.x.x.x:443: connect: connection timed out.