[Documentation] Add docs on setting timezone for containers (#1072)

CHANGELOG.md

@@ -9,6 +9,7 @@
 - (Feature) Use only connections for healthy members
 - (Feature) Set condition to shrink agent volume size
 - (Bugfix) Check serving servers
+- (Documentation) Add docs on setting timezone for containers
 
 ## [1.2.15](https://github.com/arangodb/kube-arangodb/tree/1.2.15) (2022-07-20)
 - (Bugfix) Ensure pod names not too long

docs/design/README.md

@@ -12,3 +12,4 @@
 - [Maintenance](./maintenance.md)
 - [Additional configuration](./additional_configuration.md)
 - [Topology awareness](./topology_awareness.md)
+- [Configuring timezone](./configuring_tz.md)

docs/design/configuring_tz.md

@@ -0,0 +1,18 @@
+# Configuring timezone
+
+To set timezone for cluster components, mount the required timezone into container
+by adjusting `spec.<group>` of ArangoDeployment resource:
+```yaml
+dbservers:
+  volumeMounts:
+    - mountPath: /etc/localtime
+      name: timezone
+  volumes:
+    - hostPath:
+        path: /usr/share/zoneinfo/Europe/Warsaw
+        type: File
+      name: timezone
+```
+
+If `/usr/share/zoneinfo` is not present on your host your probably have to install `tzdata` package. 
+