doc(self-managed): clarify usage of keycloak images for bitnamilegacy…

[leiicamundi]

Description

This PR is related to the question https://camunda.slack.com/archives/C03UR0V2R2M/p1764857316964609

It improves the description of the keycloak images as those have multiple sources legacy / vendor-ee

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support. (add bug or support label)
• This is already available but undocumented and should be released within a week. (add available & undocumented label)
• This is on a specific schedule and the assignee will coordinate a release with the Documentation team. (create draft PR and/or add hold label)
• This is part of a scheduled alpha or minor. (add alpha or minor label)
• There is no urgency with this change (add low prio label)

PR Checklist

• The commit history of this PR is cleaned up, using {type}(scope): {description} commit message(s)

• My changes are for an upcoming minor release and are in the /docs directory (version 8.9).
• My changes are for an already released minor and are in a /versioned_docs directory.

• I added a DRI, team, or delegate as a reviewer for technical accuracy and grammar/style:
  • Engineering team review
  • Technical writer review via @camunda/tech-writers unless working with an embedded writer.

[Copilot]

Pull request overview

This PR clarifies the documentation for Keycloak images used in Camunda's air-gapped installations, addressing confusion about multiple image sources (bitnamilegacy vs vendor-ee).

Key changes:

• Updated Keycloak image references to use camunda/keycloak (open-source) and registry.camunda.cloud/keycloak-ee/keycloak (enterprise)
• Added comprehensive documentation section explaining Camunda's custom Keycloak images, including variants, registries, tag prefixes, and availability
• Included notes about backward compatibility and usage recommendations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
versioned_docs/version-8.8/self-managed/deployment/helm/configure/registry-and-images/air-gapped-installation.md	Updates Keycloak image references and adds detailed documentation section for version 8.8
docs/self-managed/deployment/helm/configure/registry-and-images/air-gapped-installation.md	Identical changes applied to current documentation version for consistency

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[mesellings]

@giorgionaps please take a look at this for @leiicamundi as a priority 🙏

[marcel-dias]

LGTM 🚀

[giorgionaps]

One minor comment from me

[leiicamundi]

@giorgionaps I've fixed the comment and enabled-auto merge, could you re-approve? Thank you

[giorgionaps]

Approved on my side

[github-actions]

🧹 Preview environment for this PR has been torn down.