Add env var to docker-compose file

Docker/prod/docker-compose.yaml

@@ -1,6 +1,8 @@
 services:
   client:
     image: uptime_client:latest
+    environment:
+      UPTIME_APP_API_BASE_URL: "http://localhost:5000/api/v1"
     ports:
       - "80:80"
       - "443:443"