add nofile ulimits to time machine docker container

tasks/timemachine.yml

@@ -17,6 +17,8 @@
       SHARENAME: "{{ timemachine_share_name }}"
     volumes:
       - "{{ timemachine_data_directory }}/data:/backups"
+    ulimits:
+      - "nofile:1048576:1048576"
     network_mode: bridge
     restart_policy: unless-stopped
     memory: 1g