store express sessions in redis

config/default.json

@@ -14,5 +14,8 @@
     "token": "aaaaa",
     "domain": "test-codemowers.eu",
     "preferredDomain": "k-space.ee"
+  },
+  "redis": {
+    "url": "redis://localhost:6379"
   }
 }

config/prod.js

@@ -10,5 +10,8 @@ module.exports = {
         url: process.env.WILDDUCK_URL,
         token: process.env.WILDDUCK_TOKEN,
         domain: process.env.WILDDUCK_DOMAIN
+    },
+    redis: {
+        url: process.env.REDIS_URL
     }
 };