feat(vault): deploy HashiCorp Vault 2.0.1 via Helm chart 0.32.0

HA raft cluster (5 replicas) with disable_mlock=true, IPC_LOCK capability,
headless-DNS retry_join, kubernetes service_registration, 10Gi cephrbd-fast-delete
PVC. Gateway API HTTPRoute on 443→8200. ArgoCD platform ApplicationSet entry added.

apps/overlays/au-syd1/vault/kustomization.yaml

@@ -2,7 +2,13 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
-namespace: vault
-
 resources:
   - ../../../base/vault
+
+helmCharts:
+  - name: vault
+    repo: https://helm.releases.hashicorp.com
+    version: "0.32.0"
+    releaseName: vault
+    namespace: vault
+    valuesFile: values.yaml

apps/overlays/au-syd1/vault/values.yaml

@@ -0,0 +1,71 @@
+server:
+  image:
+    repository: hashicorp/vault
+    tag: "2.0.1"
+
+  ha:
+    enabled: true
+    replicas: 5
+
+    raft:
+      enabled: true
+      setNodeId: true
+      config: |
+        ui            = true
+        disable_mlock = true
+
+        listener "tcp" {
+          address         = "[::]:8200"
+          cluster_address = "[::]:8201"
+          tls_disable     = "true"
+        }
+
+        storage "raft" {
+          path = "/vault/data"
+
+          retry_join {
+            leader_api_addr = "http://vault-0.vault-internal.vault.svc.cluster.local:8200"
+          }
+          retry_join {
+            leader_api_addr = "http://vault-1.vault-internal.vault.svc.cluster.local:8200"
+          }
+          retry_join {
+            leader_api_addr = "http://vault-2.vault-internal.vault.svc.cluster.local:8200"
+          }
+          retry_join {
+            leader_api_addr = "http://vault-3.vault-internal.vault.svc.cluster.local:8200"
+          }
+          retry_join {
+            leader_api_addr = "http://vault-4.vault-internal.vault.svc.cluster.local:8200"
+          }
+        }
+
+        service_registration "kubernetes" {}
+
+  dataStorage:
+    enabled: true
+    size: 10Gi
+    storageClass: cephrbd-fast-delete
+    accessMode: ReadWriteOnce
+
+  statefulSet:
+    securityContext:
+      container:
+        capabilities:
+          add:
+            - IPC_LOCK
+
+  resources:
+    requests:
+      memory: 256Mi
+      cpu: 100m
+    limits:
+      memory: 2Gi
+      cpu: 1000m
+
+injector:
+  enabled: false
+
+ui:
+  enabled: true
+  serviceType: ClusterIP