[FIX] fs_storage: add missing sudo when creating FilsSystem

This is necessary for non admin users to access file systems, for
instance for attachments.

This went unnoticed so far presumably because the filesystem is cached
and likely accessed by the server during server bootstrap.

fs_storage/models/fs_storage.py

@@ -305,7 +305,7 @@ def fs(self) -> fsspec.AbstractFileSystem:
         """Get the fsspec filesystem for this backend."""
         self.ensure_one()
         if not self.__fs:
-            self.__fs = self._get_filesystem()
+            self.__fs = self.sudo()._get_filesystem()
         if not tools.config["test_enable"]:
             # Check whether we need to invalidate FS cache or not.
             # Use a marker file to limit the scope of the LS command for performance.