OCPBUGS-44840: Mount the user-ca-bundle into ICC

[derekhiggins]

The ICC will then add it to the custom image in order to pull down the IPA image.

[openshift-ci-robot]

@derekhiggins: This pull request references Jira Issue OCPBUGS-44840, which is invalid:

• expected the bug to target the "4.18.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

The ICC will then add it to the custom image in order to pull down the IPA image.

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[openshift-ci]

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[openshift-ci]

@derekhiggins: all tests passed!

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