set securityContext for redis pod to run as redis user

redis/values.yaml

@@ -133,11 +133,11 @@ redis: &redis_config
   priorityClassName: ''
 
   # -- Pod-level security attributes. More info [here](https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#security-context).
-  securityContext: {}
-    # fsGroup: 1000
-    # runAsNonRoot: true
-    # runAsGroup: 1000
-    # runAsUser: 1000
+  securityContext:
+    fsGroup: 999
+    runAsNonRoot: true
+    runAsGroup: 999
+    runAsUser: 999
 
   # -- Compute resources used by the container. More info [here](https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/).
   resources: {}