Use hash for content_id

Author: yuvipanda

repo2docker/contentproviders/dataverse.py

@@ -187,4 +187,4 @@ def fetch(self, spec, output_dir, yield_output=False):
     @property
     def content_id(self):
         """The Dataverse persistent identifier."""
-        return self.url
+        return hashlib.sha256(self.url.encode()).hexdigest()