Add force option in upgrade script

data/actionsmap/yunohost.yml

@@ -640,6 +640,10 @@ app:
                 -f:
                     full: --file
                     help: Folder or tarball for upgrade
+                -F:
+                    full: --force
+                    help: Force the update, even though the app is up to date
+                    action: store_true
 
         ### app_change_url()
         change-url:

src/yunohost/app.py

@@ -410,7 +410,7 @@ def app_change_url(operation_logger, app, domain, path):
     hook_callback('post_app_change_url', args=args_list, env=env_dict)
 
 
-def app_upgrade(app=[], url=None, file=None):
+def app_upgrade(app=[], url=None, file=None, force=False):
     """
     Upgrade app