fix: ajouter packaging_format dans le manifest du catalogue v3/apps.json

v3/apps.json

@@ -12,6 +12,7 @@
       "category": "admin",
       "subtags": [],
       "manifest": {
+        "packaging_format": 2,
         "id": "backupmanager",
         "name": "Backup Manager",
         "version": "1.1~ynh1",