feat: initialise barebones server

- manage incus servers init

modules/incus/templates/join_preseed.yaml.erb

@@ -1,20 +1,18 @@
-config: {}
+config:
+  core.https_address: <%= @server_fqdn %>:<%= @server_port %>
 networks: []
 storage_pools: []
-profiles: []
+storage_volumes: []
+profiles:
+- config: {}
+  description: ""
+  devices:
+    eth0:
+      name: eth0
+      nictype: bridged
+      parent: <%= @bridge %>
+      type: nic
+  name: default
+  project: default
 projects: []
-cluster:
-  server_name: <%= @server_fqdn %>
-  enabled: true
-  member_config:
-  - entity: storage-pool
-    name: local
-    key: source
-    value: ""
-    description: '"source" property for storage pool "local"'
-  cluster_address: <%= @cluster_address %>:<%= @server_port %>
-  cluster_certificate: |
-    <%= @certificate %>
-  server_address: <%= @server_fqdn %>:<%= @server_port %>
-  cluster_token: <%= @cluster_token %>
-  cluster_certificate_path: ""
+cluster: null