OSDOCS#12643: Docs for BYO OIDC auth provider

[bergerhoffer]

Version(s):
4.19

Issue:
https://issues.redhat.com/browse/OSDOCS-12643

Link to docs preview:
https://93779--ocpdocs-pr.netlify.app/openshift-enterprise/latest/authentication/external-auth.html

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Jun 06 19:08:15 - Prow CI generated the docs preview:

https://93779--ocpdocs-pr.netlify.app/openshift-enterprise/latest/authentication/external-auth.html
https://93779--ocpdocs-pr.netlify.app/openshift-enterprise/latest/authentication/identity_providers/configuring-oidc-identity-provider.html

[bergerhoffer]

@xingxingxia I worked on some updates to try to address the whole complications what kind of kubeconfig file (or other long-lived method of logging in) that they need.

Here is the diff: https://github.com/openshift/openshift-docs/compare/77d6e302898e243b43e67f118def6eebbfdc21cf..07f266fd1eb0ee33350890579aade6f2ebd3e841

Let me know what you think of the changes.

[xingxingxia]

@bergerhoffer LGTM from QE perspective except above two final issues.

[liouk]

@bergerhoffer LGTM as well 👍

[xingxingxia]

Final updates are great
/lgtm

[openshift-ci]

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[xiuwang]

Final updates are great
/lgtm

[bergerhoffer]

/cherrypick enterprise-4.19

[openshift-cherrypick-robot]

@bergerhoffer: new pull request created: #94427

In response to this:

/cherrypick enterprise-4.19

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