NO-ISSUE: switch building the ove ISO by script

[andfasano]

this is mainly required to reduce the overall step time and avoid CI job timeouts

Based on @rwsu PR #1830

[bfournie]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bfournie

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[openshift-ci]

@andfasano: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-agent-ha-dualstack	911a55e	link	false	/test e2e-agent-ha-dualstack

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[rwsu]

/lgtm