Change name of backup file to avoid conflict with dist file backup

	modified:   tasks/main.yml

tasks/main.yml

@@ -22,7 +22,7 @@
 - name: backup APT sources
   copy:
     src: /etc/apt/sources.list
-    dest: /etc/apt/sources.list.orig
+    dest: /etc/apt/sources.list.cu
     force: no
   tags:
     - apt-config-sources