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

roles/configuration/templates/network_netplan.j2

@@ -0,0 +1,29 @@
+network:
+  version: 2
+  ethernets:
+{% for iface in system_cfg.network.interfaces %}
+    lan{{ loop.index0 }}:
+{# Unnamed binds the first ethernet by name glob (e* = en*/eth*, netplan match.name takes one glob), never a MAC (#12). #}
+      match:
+        name: "{{ iface.name if (iface.name | default('') | string | length) else 'e*' }}"
+{% if iface.ip | default('') | string | length %}
+      addresses:
+        - {{ iface.ip }}/{{ iface.prefix }}
+{% if iface.gateway | default('') | string | length %}
+      routes:
+        - to: default
+          via: {{ iface.gateway }}
+{% endif %}
+{% else %}
+      dhcp4: true
+{% endif %}
+{% if loop.index0 == 0 and (configuration_dns_list or configuration_dns_search) %}
+      nameservers:
+{% if configuration_dns_list %}
+        addresses: [{{ configuration_dns_list | join(', ') }}]
+{% endif %}
+{% if configuration_dns_search %}
+        search: [{{ configuration_dns_search | join(', ') }}]
+{% endif %}
+{% endif %}
+{% endfor %}