unbound(role): fix unbound prometheus exporter install on debian

- download debian image from github und verify checksum
- setup systemd service unit

roles/unbound/tasks/main.yml

@@ -31,13 +31,6 @@
         group: unbound
         mode: u=rw,g=r,o=r
 
-    - name: ensure unbound is running and enabled
-      become: true
-      ansible.builtin.systemd:
-        name: unbound.service
-        state: started
-        enabled: true
-
     - name: disable systemd-resolved
       when: unbound_disable_systemd_networkd
       ansible.builtin.include_role:
@@ -47,6 +40,13 @@
         deploy_systemd_resolved_config__dns:
           - 127.0.0.1
 
+    - name: ensure unbound is running and enabled
+      become: true
+      ansible.builtin.systemd:
+        name: unbound.service
+        state: started
+        enabled: true
+
     - name: install and configure prometheus-exporter for unbound
       ansible.builtin.import_tasks: prometheus-exporter.yml
       when: unbound_install_prometheus_exporter