update docs about ram only redis

docker-compose.dev.yaml

@@ -4,6 +4,11 @@
 services:
   redis:
     image: redis:7-alpine
+    # This is required to stay in RAM only.
+    command: redis-server --save "" --appendonly no
+    # Additionally, you can set a size limit. See link below on how to customise.
+    # https://redis.io/docs/manual/eviction/
+    # --maxmemory 1gb --maxmemory-policy allkeys-lrulpine
     ports:
       - 6379:6379