Add role for ensuring system is updated and potentially rebooted

The role also cleans up the local repository of retrieved package files
that can no longer be downloaded.

playbooks/roles/system_update/tasks/main.yaml

@@ -0,0 +1,7 @@
+- name: Ensure the system is updated and no longer needed files are cleaned up
+  ansible.builtin.apt:
+    update_cache: true
+    upgrade: dist
+    autoclean: true
+  become: true
+  notify: Reboot, if stuff changed, for good measure