fix(keycloak): add startupProbe, remove initialDelaySeconds

Use a startupProbe to defer liveness/readiness checks until Keycloak
has fully started, instead of relying on initialDelaySeconds. This is
more robust for applications with variable startup times.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: mattia-eleuteri <mattia@hidora.io>
(cherry picked from commit d18ed79382)

packages/system/keycloak/templates/sts.yaml

@@ -135,11 +135,16 @@ spec:
             - name: management
               containerPort: 9000
               protocol: TCP
+          startupProbe:
+            httpGet:
+              path: /health/ready
+              port: management
+            failureThreshold: 30
+            periodSeconds: 10
           livenessProbe:
             httpGet:
               path: /health/live
               port: management
-            initialDelaySeconds: 120
             periodSeconds: 15
             timeoutSeconds: 5
             failureThreshold: 5
@@ -147,7 +152,6 @@ spec:
             httpGet:
               path: /health/ready
               port: management
-            initialDelaySeconds: 60
             periodSeconds: 10
             timeoutSeconds: 5
             failureThreshold: 3