This patch lets Cozystack admins specify initContainers that will run
`cp -r /themes/ /opt/keycloak/themes/` on startup, effectively providing
an interface for operators to inject custom themes into the keycloak
deployment to customize the UI.

```release-note
[keycloak] Enable injection of user-provided themes for Keycloak via
initContainers.
```

Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>

Add securityContext to theme init containers matching the main
container security posture. Add input validation for theme entries:
required fields, DNS-1123 name sanitization, duplicate detection,
and container name length limit. Add imagePullSecrets support for
private registries and sizeLimit on the emptyDir volume.

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

dosubot bot added size:M

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Document the theme injection feature: theme image contract,
configuration via Package resource, imagePullSecrets for private
registries, and theme activation in Keycloak admin console.

Companion to cozystack/cozystack#2142.

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

dosubot bot added the lgtm

label

kvaps deleted the feat/keycloak-themes branch

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## What this PR does

Adds documentation for custom Keycloak theme injection to the White
Labeling guide.

New sections cover:
- Theme image contract (`/themes/` directory structure)
- Configuration via `cozystack.keycloak` Package resource
- `imagePullSecrets` for private registries
- Theme activation in Keycloak admin console

### Companion PR

Implementation: cozystack/cozystack#2142

### Release note

```release-note
[docs] Add custom Keycloak themes documentation to White Labeling guide
```


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Added comprehensive guide for custom Keycloak themes, covering
container image directory structure, Package configuration, private
registry support, and admin console activation steps.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->