sso: add callout to certificate instructions (#22193)

## Description
- Good callout that we should clarify that copy/pasting the certificate
values includes the `----BEGIN CERTIFICATE---` and `----END
CERTIFICATE----` lines. This applies to both Okta and Entra examples, as
confirmed in my test org
- I will pass on to IAM about adding placeholder text, I think would be
more valuable than an example in docs

## Related issues or tickets
https://github.com/docker/docs/issues/22176#event-16632900876

## Reviews
- [ ] Editorial review
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Sarah Sanders 2025-03-07 11:26:05 -05:00 committed by GitHub
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@ -144,6 +144,12 @@ After creating your connection in Docker and your IdP, you can cross-connect the
2. Copy the following values from the Okta SAML setup instruction page:
- **SAML Sign-in URL**
- **x509 Certificate**
> [!IMPORTANT]
>
> You must copy the entire contents of your **x509 Certificate**,
including the `----BEGIN CERTIFICATE----` and `----END CERTIFICATE----` lines.
3. Open Docker Hub or the Admin Console. Your SSO configuration page should still be open from Step one of this guide.
4. Select **Next** to open the **Update single-sign on connection** page.
5. Paste your Okta **SAML Sign-in URL** and **x509 Certificate** values in Docker.
@ -158,7 +164,13 @@ After creating your connection in Docker and your IdP, you can cross-connect the
2. Open your downloaded **Certificate (Base64)** in a text editor.
3. Copy the following values:
- From Azure AD: **Login URL**
- Copy your the contents of your **Certificate (Base64)** file from your text editor
- Copy the contents of your **Certificate (Base64)** file from your text editor
> [!IMPORTANT]
>
> You must copy the entire contents of your **Certificate (base64)**,
including the `----BEGIN CERTIFICATE----` and `----END CERTIFICATE----` lines.
4. Open Docker Hub or the Admin Console. Your SSO configuration page should still be open from Step one of this guide.
5. Paste your **Login URL** and **Certificate (Base64)** values in Docker.
6. Select **Next**.