Set export job timeout to 2 hours

arkindex/documents/export/__init__.py

@@ -99,7 +99,7 @@ def send_email(subject, template_name, corpus_export, **context):
         logger.error(f'Failed to send email to {corpus_export.user.email}')
 
 
-@job('high')
+@job('high', timeout=7200)
 def export_corpus(corpus_export: CorpusExport) -> None:
     _, db_path = tempfile.mkstemp(suffix='db')
     try: