Add persistence for redis to docker-compose

docker-compose.yml

@@ -15,4 +15,7 @@ services:
   redis:
     image: redis:alpine
     ports:
-      - "127.0.0.1:6379:6379"
+      - "127.0.0.1:6379:6379"
+    command: redis-server --save 5 1 --loglevel warning
+    volumes:
+      - ./redis:/data