Record dependency of nginx on lsmb service

This dependency causes the lsmbdata volume to be forcibly created from the lsmb container
which means that the correct assets will be copied in.

docker-compose-reverseproxy.yml

@@ -17,6 +17,8 @@
 version: "3.2"
 services:
   proxy:
+    depends_on:
+      - lsmb
     image: nginx:1-alpine
     volumes:
       - "lsmbdata:/srv/ledgersmb"