AGENT-864: cleanup dnf cache after installing node-joiner reqs

[andfasano]

Fix to avoid including the cache in the final image

[openshift-ci-robot]

@andfasano: This pull request references AGENT-864 which is a valid jira issue.

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In response to this:

Fix to avoid including the cache in the final image

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[r4f4]

/lgtm

[zaneb]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zaneb

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• images/baremetal/OWNERS [zaneb]

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[openshift-ci]

@andfasano: The following tests 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-metal-ipi-ovn	7936f19	link	false	/test e2e-metal-ipi-ovn
ci/prow/e2e-metal-assisted	7936f19	link	false	/test e2e-metal-assisted
ci/prow/e2e-metal-single-node-live-iso	7936f19	link	false	/test e2e-metal-single-node-live-iso

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[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build ose-installer-altinfra-container-v4.17.0-202404301246.p0.g7dd2fbc.assembly.stream.el9 for distgit ose-installer-altinfra.
All builds following this will include this PR.