set cgo as the default DNS resolver

Deploy/docker-compose.yml

@@ -11,6 +11,8 @@ services:
     volumes:
       - /data/registry:/storage
       - ./config/registry/:/etc/registry/
+    environment:
+      - GODEBUG=netdns=cgo
     ports:
       - 5001:5001
     command:

Deploy/templates/ui/env

@@ -12,3 +12,4 @@ LDAP_URL=$ldap_url
 LDAP_BASE_DN=$ldap_basedn
 SELF_REGISTRATION=$self_registration
 LOG_LEVEL=debug
+GODEBUG=netdns=cgo