Update fleet.yaml

fleet.yaml

-defaultNamespace: kube-system
+defaultNamespace: gitlab
 helm:
-  releaseName: kured
-  repo: https://kubereboot.github.io/charts
-  chart: kured
-  version: 5.2.0
+  releaseName: gitlab-runner
+  repo: https://charts.gitlab.io
+  chart: gitlab-runner
+  version: 0.56.1
   values:
-    configuration:
-      rebootDays: ["su"]
-      startTime: "2am"
-      endTime: "5am"
-      timeZone: "Europe/Berlin"
-      period: "10m0s"
-      drainGracePeriod: "240"
-    tolerations:
-      - effect: NoSchedule
-        key: node-role.kubernetes.io/controlplane
-        value: "true"
-      - effect: NoExecute
-        key: node-role.kubernetes.io/etcd
-        value: "true"
+    gitlabUrl: https://gitlab.jsc.fz-juelich.de/
+    rbac:
+      create: true
+    runners:
+      secret: gitlab-runner-secret