Do not try to pull local build images.

Config/DNS/docker-compose.example.yml

@@ -8,9 +8,10 @@
 services:
   app:
     container_name: dns-app
-    image: hyperling/dns:latest
     build:
       context: ./
+    image: hyperling/dns:latest
+    pull_policy: never
     restart: always
     ports:
       - "53:53/udp"