OSDOCS-10323: add note about coreos-installer reqs

[jldohmann]

Version(s): 4.12+

Issue: https://issues.redhat.com/browse/OSDOCS-10323

Link to docs preview: https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal.html#creating-machines-bare-metal_installing-bare-metal

QE review:

• QE has approved this change.

Additional information:

[openshift-ci-robot]

@jldohmann: This pull request references OSDOCS-10323 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.20.0" version, but no target version was set.

In response to this:

Version(s): 4.12+

Issue: https://issues.redhat.com/browse/OSDOCS-10323

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

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[ocpdocs-previewbot]

🤖 Tue Jun 24 17:13:03 - Prow CI generated the docs preview:

https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal.html
https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal-network-customizations.html
https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-restricted-networks-bare-metal.html
https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_platform_agnostic/installing-platform-agnostic.html

[openshift-ci-robot]

@jldohmann: This pull request references OSDOCS-10323 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.20.0" version, but no target version was set.

In response to this:

Version(s): 4.12+

Issue: https://issues.redhat.com/browse/OSDOCS-10323

Link to docs preview: https://95130--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal.html#creating-machines-bare-metal_installing-bare-metal

QE review:

• QE has approved this change.

Additional information:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[jldohmann]

@HuijingHei is this something you could PTAL at for QE ack? this docs PR adds a note about newer coreos-installer versions only being supported on RHEL9. the linked JIRA ticket has a little bit more information. thank you 🙇

[rh-tokeefe]

/label peer-review-in-progress

[rh-tokeefe]

One small thing to consider as a possibility. Otherwise LGTM.

[rh-tokeefe]

/label peer-review-done

[rh-tokeefe]

/remove-label peer-review-in-progress

[rh-tokeefe]

/remove-label peer-review-needed

[openshift-ci]

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