feat: add incus module (#230)

- add a basic incus module

Reviewed-on: https://git.query.consul/unkinben/puppet-prod/pulls/230

modules/incus/templates/join_preseed.yaml.erb

@@ -0,0 +1,20 @@
+config: {}
+networks: []
+storage_pools: []
+profiles: []
+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: ""