feat(clickhouse): add config override capability

Adds support for overriding ClickHouse server configurations by:
- Creating a new ConfigMap to store custom XML configurations
- Mounting the ConfigMap to ClickHouse pods under /etc/clickhouse-server/config.d
- Adding configOverride field to values.yaml with examples

Signed-off-by: rjshrjndrn <rjshrjndrn@gmail.com>

scripts/helmcharts/databases/charts/clickhouse/templates/configmap.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: clickhouse-override
+data:
+  {{- range $filename, $content := .Values.configOverride }}
+  {{ $filename }}: |-
+{{ $content | indent 4 }}
+  {{- end }}
+

scripts/helmcharts/databases/charts/clickhouse/templates/statefulset.yaml

@@ -73,6 +73,8 @@ spec:
           volumeMounts:
           - name: default-chi-openreplay-clickhouse-replicated-0-0-0 
             mountPath: /var/lib/clickhouse
+          - name: clickhouse-override-config
+            mountPath: /etc/clickhouse-server/config.d
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
       {{- with .Values.nodeSelector }}
@@ -87,6 +89,11 @@ spec:
       tolerations:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      volumes:
+        - name: clickhouse-override-config
+          configMap:
+            name: clickhouse-override
+            optional: true
   volumeClaimTemplates:
   - metadata:
       name: default-chi-openreplay-clickhouse-replicated-0-0-0

scripts/helmcharts/databases/charts/clickhouse/values.yaml

@@ -83,3 +83,28 @@ tolerations: []
 
 affinity: {}
 storageSize: 100Gi
+
+configOverride:
+  zzoverride.xml: |-
+    <clickhouse>
+      <logger>
+          <level>information</level>
+          <console>true</console>
+      <log remove="remove"></log>
+      <errorlog remove="remove"></errorlog>
+      </logger>
+      <listen_host>0.0.0.0</listen_host>
+      <keep_alive_timeout>100</keep_alive_timeout>
+      <concurrent_threads_soft_limit_num>64</concurrent_threads_soft_limit_num>
+      <concurrent_threads_soft_limit_ratio_to_cores>2</concurrent_threads_soft_limit_ratio_to_cores>
+      <concurrent_threads_scheduler>fair_round_robin</concurrent_threads_scheduler>
+      <max_server_memory_usage>102400000000</max_server_memory_usage>
+      <max_thread_pool_size>10000</max_thread_pool_size>
+      <max_server_memory_usage_to_ram_ratio>0.8</max_server_memory_usage_to_ram_ratio>
+      <uncompressed_cache_size remove="remove"></uncompressed_cache_size>
+      <mmap_cache_size>26214</mmap_cache_size>
+    </clickhouse>
+  # another-config.xml: |-
+  #   <clickhouse>
+  #     <another_setting>value</another_setting>
+  #   </clickhouse>