feat(leaderelection): impl leader election

Signed-off-by: Furkan <furkan.turkal@trendyol.com>
Signed-off-by: eminaktas <eminaktas34@gmail.com>
Co-authored-by: Emin <emin.aktas@trendyol.com>
Co-authored-by: Yasin <yasintaha.erol@trendyol.com>

kubernetes/base/rbac.yaml

@@ -22,6 +22,13 @@ rules:
 - apiGroups: ["scheduling.k8s.io"]
   resources: ["priorityclasses"]
   verbs: ["get", "watch", "list"]
+- apiGroups: ["coordination.k8s.io"]
+  resources: ["leases"]
+  verbs: ["create"]
+- apiGroups: ["coordination.k8s.io"]
+  resources: ["leases"]
+  resourceNames: ["descheduler"]
+  verbs: ["get", "patch", "delete"]
 ---
 apiVersion: v1
 kind: ServiceAccount
@@ -41,4 +48,3 @@ subjects:
   - name: descheduler-sa
     kind: ServiceAccount
     namespace: kube-system
-