Default redis configuration for docker setup

docker/conf/redis.conf

@@ -0,0 +1,12 @@
+# Set the maximum memory usage
+maxmemory 2GB
+
+# Evict old keys instead of growing
+maxmemory-policy allkeys-lru
+
+# Disable disk persistence
+appendonly no
+save ""
+
+# Optional: reduce fragmentation
+activedefrag yes