try kustomize overlays

clickhouse/overlays/kustomization.yaml

@@ -0,0 +1,11 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+helmCharts:
+  - name: clickhouse
+    chart: ../../clickhouse   # chemin relatif vers le Chart.yaml
+    releaseName: clickhouse
+    namespace: tools
+    valuesFile: values.yaml   # si tu veux passer des valeurs custom
+patches:
+  - 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