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/main.yaml

@@ -1,7 +1,9 @@
 ---
-- name: "Add incus repository to system"
+## for bookworm only
+- name: "Add incus repository to bookworm system"
   ansible.builtin.include_tasks: add-repo.yaml
+  when: ansible_distribution == "Debian" and ansible_distribution_release == "bookworm"
 
-  # TODO: Should presumably be split
-- name: "Install and bootstrap incus"
-  ansible.builtin.include_tasks: bootstrap.yaml
+# TODO: there might be remaining issues on other OSes like centos, etc
+- name: Install incus
+  ansible.builtin.include_tasks: install.yaml