deploy: add redis image

deployment/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
 
   postgres:
-    image: postgres
+    image: postgres:alpine
     restart: always
     ports:
       - "5432:5432"
@@ -20,3 +20,15 @@ services:
     restart: always
     ports:
       - 8080:8080
+
+  redis:
+    image: redis:alpine
+    restart: always
+    ports:
+      - "6379:6379"
+    deploy:
+      mode: replicated
+      replicas: 1
+    command: redis-server --save 20 1 --loglevel warning
+    volumes:
+      - ../../db_data_howmuch/redis/:/data