Update local Keycloak image to match deployed config

[eleftherias]

Summary

Update the local keycloak docker image to have the same configuration as the deployed Keycloak in staging.
This makes local testing and verification more reliable.

Change Type

Mark the type of change your PR introduces:

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Outline how the changes were tested, including steps to reproduce and any relevant configurations.
Attach screenshots if helpful.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 54.437%. remained the same
when pulling 633aeb2 on eleftherias:keycloak-match-deployed
into 5707473 on stacklok:main.