roles/common: ignore apt sources.list on Scaleway

While testing Debian 12 on Scaleway I noticed their apt sources.list
is in some weird format I've never seen before, so let's skip it on
those hosts.

roles/common/tasks/packages_Debian.yml

@@ -15,9 +15,17 @@
         state: directory
       when: ansible_distribution_major_version is version('12', '<')
 
+    # Scaleway seems to use a weird sources.list format as of Debian 12?
+    - name: Check for weird Debian sources
+      ansible.builtin.stat:
+        path: /etc/apt/sources.list.d/debian.sources
+      register: weird_debian_sources_stat
+
     - name: Configure apt mirror
       ansible.builtin.template: src=sources.list.j2 dest=/etc/apt/sources.list owner=root group=root mode=0644
-      when: ansible_architecture != 'armv7l'
+      when:
+        - ansible_architecture != 'armv7l'
+        - not weird_debian_sources_stat
 
     - name: Set fact for base packages
       ansible.builtin.set_fact: