fix: remove invalid condition from compose example

docker-compose.example.yml

@@ -9,7 +9,6 @@ services:
       - ./backend/.env
     ports:
       - "127.0.0.1:8000:8000"
-    condition: service_healthy
     healthcheck:
       test: ["CMD-SHELL", "wget -qO- http://127.0.0.1:8000/healthz >/dev/null || exit 1"]
       interval: 30s
@@ -27,4 +26,4 @@ networks:
   ose-cache:
     external: true
   nginx:
-    external: true
+    external: true