Add playbook and accompanying role for doing maintenance

playbooks/roles/apt_update_and_upgrade/README.md

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+# Role `apt_update_and_upgrade`
+
+This role does an `apt-get update`, `apt-get dist-upgrade` and a potential reboot (if packages got upgraded) on the specified hosts.
+
+## `hosts`
+
+The `hosts` for this role need to be the VMs, which should be updated and upgraded.
+
+## Required Variables
+
+This role doesn't have any required variables.

playbooks/roles/apt_update_and_upgrade/tasks/main.yaml

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+- name: update, upgrade and potentially reboot
+  become: true
+  block:
+  - name: apt-get update
+    ansible.builtin.apt:
+      update-cache: true
+
+  - name: apt-get dist-upgrade
+    ansible.builtin.apt:
+      upgrade: dist
+    register: apt_update_and_upgrade__upgrade_result
+
+  - name: reboot, after package upgrade
+    ansible.builtin.reboot:
+    when: apt_update_and_upgrade__upgrade_result.changed