added startup probe to prevent failure on slow startup

yacy/templates/statefulset.yaml

@@ -123,6 +123,12 @@ spec:
           httpGet:
             path: /
             port: http
+        startupProbe:
+          httpGet:
+            path: /
+            port: http
+          failureThreshold: 30
+          periodSeconds: 10
         volumeMounts:
         - name: yacy-data
           mountPath: /opt/yacy_search_server/DATA