Add netcat install in dockerfile to provide a way to healthcheck in docker compose (#572)

docker-compose.yml

@@ -31,6 +31,9 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
+    healthcheck:
+      test: ["CMD", "nc", "-vz", "127.0.0.1", "8081"]
+      interval: 5s
 
 volumes:
   data: