Use intermediate cache when just calculating etag

dandi/support/digests.py

@@ -79,7 +79,7 @@ def __call__(self, fpath):
 @checksums.memoize_path
 def get_digest(filepath, digest="sha256") -> str:
     if digest == "dandi-etag":
-        return DandiETag.from_file(filepath).as_str()
+        return get_dandietag(filepath).as_str()
     else:
         return Digester([digest])(filepath)[digest]