Fix wrong baseurl for centos extra repo for Oracle Linux

[buker]

What type of PR is this?

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/kind api-change
/kind bug

/kind cleanup
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What this PR does / why we need it:
Fixing issue #8207
Which issue(s) this PR fixes:

Fixes #8207

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix wrong baseurl for centos extra repo for Oracle Linux (missing `/os/`)

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• ✅ Łukasz Żułnowski (8f97d84)

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[cristicalin]

Hi @buker , thank you for this fix.

Please sign the CLA so we may include this fix: https://git.k8s.io/community/CLA.md#the-contributor-license-agreement

[oomichi]

This seems valid as we can see repomd.xml under http://mirror.centos.org/centos/8/extras/x86_64/os/repodata/

/lgtm

[oomichi]

forgot to run the test..

/ok-to-test

[floryut]

@buker Thank you 👍

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: buker, floryut

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[cristicalin]

It seems this change broke OEL7 support see https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/-/jobs/1804750376#L1514, the repo convention is different for CentOS Extras 7 vs CentOS Extras 8.

On a second note, how will this affect our ability to deploy on OEL8 post CentOS 8 EOL?