Rename "local-net" to default and fix healthcheck network

_ansible/roles/healthcheck/files/docker-compose.yml

@@ -10,6 +10,7 @@ x-common-elements:
     - service.env
   volumes:
     - ./data/:/opt
+  network_mode: host
 
 services:
   http:
@@ -21,8 +22,3 @@ services:
   mail:
     <<: *common-elements
     command: "/opt/mail"
-
-networks:
-  default:
-    name: healthcheck
-    external: true