try kustomize overlays

clickhouse/overlays/kustomization.yaml

@@ -0,0 +1,8 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../  # remonte vers le chart ClickHouse (Chart.yaml)
+
+patchesStrategicMerge:
+  - patch-volumeMount.yaml

clickhouse/overlays/patch-volumeMount.yaml

@@ -0,0 +1,14 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: clickhouse
+spec:
+  template:
+    spec:
+      containers:
+        - name: clickhouse
+          volumeMounts:
+            - name: config-volume
+              mountPath: /etc/clickhouse-server/users.d/custom-users.xml
+              subPath: custom-users.xml
+              readOnly: true