Add argocd cli to Openshift CI test container

[flacatus]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[flacatus]

/retest

[openshift-ci]

@flacatus: 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/rhtap-installer-yamllint	563ec35	link	false	/test rhtap-installer-yamllint

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