Add 'single_external' interface role

For prx node

Related-Bug: PROD-22111

Change-Id: If0939e54efc1746a898566801b39e6ae89f8fa7d
diff --git "a/\173\043 interfaces \043\175/single_external" "b/\173\043 interfaces \043\175/single_external"
new file mode 100644
index 0000000..8b88bdc
--- /dev/null
+++ "b/\173\043 interfaces \043\175/single_external"
@@ -0,0 +1,15 @@
+{#- External network. For proxy and other nodes with endpoints from external network #}
+{#- Provides:                         #}
+{#-   (linux interface) + address #}
+{#- Requires:                         #}
+{#-   _param:external_address          #}
+{#-   _param:external_network_netmask       #}
+              # {{ interfaces_role }}
+              {%- set interface_name = interfaces.keys()[0] %}
+              {{ interface_name }}:
+                enabled: true
+                name: {{ interface_name }}
+                address: ${_param:_esc}{_param:external_address}
+                netmask: ${_param:_esc}{_param:external_network_netmask}
+                proto: static
+                type: eth