no change dist when not upgrade

tasks/utility.yml

@@ -60,7 +60,16 @@
       deb {{mirror_debian}}/debian buster-updates main contrib non-free
       deb {{mirror_debian_security}}/debian-security buster/updates main contrib non-free
     dest: /etc/apt/sources.list
-  when: ansible_distribution == 'Debian'
+  when: ansible_distribution == 'Debian' and upgrade
+- name: 系统源 (Debian)
+  become: true
+  copy:
+    content: |
+      deb {{mirror_debian}}/debian {{ ansible_distribution_release }} main contrib non-free
+      deb {{mirror_debian}}/debian {{ ansible_distribution_release }}-updates main contrib non-free
+      deb {{mirror_debian_security}}/debian-security {{ ansible_distribution_release }}/updates main contrib non-free
+    dest: /etc/apt/sources.list
+  when: ansible_distribution == 'Debian' and not upgrade
 - name: 系统源 (Ubuntu)
   become: true
   copy: