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

roles/configuration/tasks/network_eni.yml

@@ -0,0 +1,35 @@
+---
+# ifupdown can't glob iface stanzas (no mapping on ifupdown2/Proxmox), so ENI binds
+# a literal name detected here. The chroot only sees live-ISO names: on a real
+# ifupdown base, set system.network.interfaces[].name to the installed name. Bootstrap
+# installs NetworkManager, so this fires only on a non-NM base image.
+- name: Detect ethernet interface names
+  ansible.builtin.command:
+    argv:
+      - ip
+      - -o
+      - link
+      - show
+  register: configuration_eni_link
+  changed_when: false
+  failed_when: false
+
+- name: Resolve detected ethernet interface names
+  ansible.builtin.set_fact:
+    configuration_eni_detected: >-
+      {{
+        configuration_eni_link.stdout | default('')
+        | regex_findall('^[0-9]+: ([^:@]+)[@:].*?link/ether', multiline=True)
+      }}
+
+- name: Ensure the network configuration directory exists
+  ansible.builtin.file:
+    path: /mnt/etc/network
+    state: directory
+    mode: "0755"
+
+- name: Write the ifupdown interfaces file
+  ansible.builtin.template:
+    src: network_eni.j2
+    dest: /mnt/etc/network/interfaces
+    mode: "0644"