Moving nomad host volume setup to its own role

ansible/roles/nomad/tasks/main.yaml

@@ -0,0 +1,8 @@
+- name: Ensure the root data directory is present
+  ansible.builtin.file:
+    path: "{{ nomad.volumes.root }}"
+    state: directory
+- name: Ensure registry volume is present
+  ansible.builtin.file:
+    path: "{{ nomad.volumes.registry }}"
+    state: directory