feat(configuration): multi-backend networking, bind by match not MAC

roles/configuration/templates/network.j2

@@ -3,12 +3,18 @@ id=LAN-{{ idx }}
 uuid={{ configuration_net_uuid }}
 type=ethernet
 autoconnect-priority=10
-{% if configuration_iface_name | length > 0 %}
-interface-name={{ configuration_iface_name }}
-{% endif %}
-
-[ipv4]
 {% set iface = configuration_iface %}
+{% if iface.name | default('') | string | length %}
+interface-name={{ iface.name }}
+
+{% else %}
+{# Bind the first available ethernet by name glob, never a MAC: a clone with a new adapter/MAC stays networked (#12). #}
+
+[match]
+interface-name=en*;eth*;
+
+{% endif %}
+[ipv4]
 {% set dns_list = configuration_dns_list %}
 {% set search_list = configuration_dns_search %}
 {% if iface.ip | default('') | string | length %}