fix: ajouter revision HEAD dans la section git du catalogue

v3/apps.json

@@ -3,7 +3,8 @@
     "backupmanager": {
       "git": {
         "url": "https://git.hansen.tl/YunoHost-Apps/backupmanager_ynh.git",
-        "branch": "main"
+        "branch": "main",
+        "revision": "HEAD"
       },
       "state": "working",
       "level": 7,