feat(helm): add priorityClassName attribute (#3301)

Co-authored-by: houseme <housemecn@gmail.com>

helm/rustfs/values.yaml

@@ -169,6 +169,10 @@ containerSecurityContext:
   allowPrivilegeEscalation: false
   runAsNonRoot: true
 
+# Name of an existing PriorityClass to assign, defining the importance of the pods compared to other pods in the cluster.
+# Ref: https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption/
+priorityClassName: ""
+
 service:
   annotations: {}
   headlessAnnotations: {} # Applied to the headless Service when mode.distributed.enabled=true