Add task to check if backports are enabled

debian-update.yml

@@ -12,12 +12,21 @@
       ansible.builtin.apt:
         upgrade: dist
 
+    - name: Check if backports are enabled in sources.list
+      ansible.builtin.lineinfile:
+        dest: /etc/apt/sources.list
+        line: "backports"
+      check_mode: true
+      register: backports
+
     - name: Perform a dist-upgrade from Debian backports
       ansible.builtin.apt:
         default_release: bookworm-backports
         update_cache: true
         upgrade: dist
-      when: ansible_distribution == 'Debian'
+      when:
+        - ansible_distribution == 'Debian'
+        - backports.stat.exists == true
 
     - name: Check if reboot is required
       ansible.builtin.stat: