feat: Update incus installation role

Now uses simple external ansible galaxy role, and should install incus
from a pre-fixed seed.

roles/incus-install/tasks/install.yaml

@@ -0,0 +1,70 @@
+# required by gliech.incus role
+- name: Ensure lxc conf directory exists
+  ansible.builtin.file:
+    state: directory
+    path: /etc/lxc
+  become: true
+
+- name: Install incus
+  ansible.builtin.import_role:
+    name: gliech.incus
+  vars:
+    incus_config:
+      config:
+        core.https_address: "[::]:8443"
+      networks:
+        - config:
+            ipv4.address: 10.172.89.1/24
+            ipv4.firewall: "true"
+            ipv4.nat: "true"
+            ipv6.address: fd42:c9d2:6e9f:be57::1/64
+            ipv6.nat: "true"
+          description: ""
+          name: incusbr0
+          type: bridge
+          project: default
+      storage_pools:
+        - config:
+            source: /var/lib/incus/storage-pools/default
+            volatile.initial_source: /var/lib/incus/storage-pools/default
+          description: ""
+          name: default
+          driver: btrfs
+        - config:
+            size: 50GiB
+            source: /var/lib/incus/disks/docker_store.img
+          description: ""
+          name: docker_store
+          driver: btrfs
+      storage_volumes: []
+      profiles:
+        - config: {}
+          description: Default Incus profile
+          devices:
+            eth0:
+              name: eth0
+              network: incusbr0
+              type: nic
+            root:
+              path: /
+              pool: default
+              type: disk
+          name: default
+          project: ""
+      projects:
+        - config:
+            features.images: "true"
+            features.networks: "true"
+            features.networks.zones: "true"
+            features.profiles: "true"
+            features.storage.buckets: "true"
+            features.storage.volumes: "true"
+            restricted: "false"
+          description: NAS
+          name: default
+      certificates: []
+      cluster_groups: []
+#   # TODO: Should presumably be split
+# - name: "Install and bootstrap incus"
+#   ansible.builtin.include_tasks: bootstrap.yaml
+#   when: ansible_distribution == "Debian" and ansible_distribution_release == "bookworm"