container: Support referring to container files by network name

roles/container/tasks/main.yaml

@@ -16,7 +16,9 @@
     network_name: "{{ network.name }}"
     network_subnet: "{{ _container_network_subnet }}"
     network_range: "{{ _container_network_range }}"
-  when: network_created_networks is not defined or network.name not in network_created_networks
+  when:
+    - "'.' not in network.name"
+    - network_created_networks is not defined or network.name not in network_created_networks
   loop: "{{ container_networks }}"
   loop_control:
     loop_var: network

roles/container/vars/main/network.yaml

@@ -3,7 +3,7 @@ _container_networks: >-
   {{
     container_networks
     | map(attribute='name')
-    | map('regex_replace', '$', '.network')
+    | map('regex_replace', '^(?!.*\.)(.*)$', '\1.network')
     | zip(container_networks | map(attribute='ip', default=''))
     | map('reject', 'equalto', '')
     | map('join', ':ip=')