fix: Keycloak chart icon URL returns 404 on Artifact Hub

[mikkeldamsgaard]

Description

Artifact Hub reports a 404 error when fetching the Keycloak chart icon. The upstream Keycloak project has renamed/moved their icon file, breaking the URL referenced in charts/keycloak/Chart.yaml.

Current (broken): https://www.keycloak.org/resources/images/keycloak_icon_512px.svg → 404
New (working): https://www.keycloak.org/resources/images/icon.svg → valid SVG

The error from Artifact Hub:

error getting logo image https://www.keycloak.org/resources/images/keycloak_icon_512px.svg: unexpected status code received: 404 (package: keycloak version: 26.5.7)

Expected behavior

The icon field in charts/keycloak/Chart.yaml should point to a valid, publicly accessible image so Artifact Hub can display the Keycloak logo correctly.

Use cases

• Users browsing Artifact Hub see a broken/missing icon for the Keycloak chart.
• Artifact Hub tracking reports errors for the kitstream-keycloak repository.

Test cases

1. Verify the new URL https://www.keycloak.org/resources/images/icon.svg returns HTTP 200 with valid SVG content.
2. Run ct lint on the chart after updating the icon URL.
3. Verify the icon renders correctly on Artifact Hub after the next chart release.

Acceptance criteria

• icon field in charts/keycloak/Chart.yaml updated to https://www.keycloak.org/resources/images/icon.svg
• Chart lints successfully
• CHANGELOG updated under Unreleased > Fixed