AETHER-182 Use persistent volume for Redis

Change-Id: I2f373b4e33174e82aaf0b35d3b808f015263a029
diff --git a/ran/accelleran-cbrs/accelleran-cbrs-common/values.yaml b/ran/accelleran-cbrs/accelleran-cbrs-common/values.yaml
index f0ea833..318f943 100644
--- a/ran/accelleran-cbrs/accelleran-cbrs-common/values.yaml
+++ b/ran/accelleran-cbrs/accelleran-cbrs-common/values.yaml
@@ -53,6 +53,11 @@
         port: 6379
         nodePort: 32000
         protocol: TCP
+    persistence:
+      enabled: true
+      storageClass: "fast-disks"
+      accessMode: ReadWriteOnce
+      size: 1Gi
   ric:
     zlogConf:
       bufferMin: 64K