fix(helm): add LoadBalancer service type support (#3049)

The service template only handled ClusterIP and NodePort via if/else-if
branches. When service.type=LoadBalancer was set, no branch matched and
the type field was omitted from the rendered Service, causing Kubernetes
to silently default to ClusterIP.

Add the missing LoadBalancer branch with support for:
- loadBalancerIP: request a specific IP (e.g. Cilium LB-IPAM, MetalLB)
- loadBalancerClass: select a specific LB implementation
- loadBalancerSourceRanges: restrict client source IPs

This is particularly useful for bare-metal / on-prem clusters using
software load balancers (Cilium LB-IPAM, MetalLB, kube-vip) where
a stable routable IP is preferable to an Ingress for S3 clients.

Co-authored-by: Claude Sonnet 4.6 <[email protected]>
Co-authored-by: houseme <[email protected]>
Co-authored-by: 安正超 <[email protected]>
Co-authored-by: cxymds <[email protected]>
Co-authored-by: majinghe <[email protected]>

helm/rustfs/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: rustfs
 description: RustFS helm chart to deploy RustFS on kubernetes cluster.
 type: application
-version: "0.4.0"
+version: "0.4.1"
 appVersion: "1.0.0-beta.4"
 home: https://rustfs.com
 icon: https://media.sys.truenas.net/apps/rustfs/icons/icon.svg

helm/rustfs/templates/service.yaml

@@ -51,6 +51,18 @@ spec:
   sessionAffinityConfig:
     clientIP:
       timeoutSeconds: 10800
+  {{- else if eq $serviceType "LoadBalancer" }}
+  type: LoadBalancer
+  {{- with .Values.service.loadBalancerIP }}
+  loadBalancerIP: {{ . }}
+  {{- end }}
+  {{- with .Values.service.loadBalancerClass }}
+  loadBalancerClass: {{ . }}
+  {{- end }}
+  {{- with .Values.service.loadBalancerSourceRanges }}
+  loadBalancerSourceRanges:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
   {{- end }}
   ports:
     - name: endpoint

helm/rustfs/values.yaml

@@ -176,6 +176,10 @@ service:
     traefik.ingress.kubernetes.io/service.sticky.cookie.samesite: none
     traefik.ingress.kubernetes.io/service.sticky.cookie.secure: "true"
   type: ClusterIP
+  # LoadBalancer-specific fields (only used when type=LoadBalancer)
+  loadBalancerIP: ""           # Request a specific IP from the load balancer (e.g. for Cilium LB-IPAM or MetalLB)
+  loadBalancerClass: ""        # Specify a load balancer implementation (e.g. "io.cilium/bgp", "metallb")
+  loadBalancerSourceRanges: [] # Restrict client IPs (e.g. ["10.0.0.0/8"])
   endpoint:
     port: 9000
     nodePort: 32000