[Fix] Return a File instead of raw text for new export endpoint (#442)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#442

epdb/legacy_api.py

@@ -2325,7 +2325,11 @@ def export(request, q: Query[PackageExportInSchema]):
         exporter = PathwayExporter(p, add_infs_to_export=ai_types)
         res = exporter.do_export()
 
-        return res
+        filename = f"{p.get_name().replace(' ', '_')}_{p.uuid}.tsv"
+        response = HttpResponse(res, content_type="text/csv")
+        response["Content-Disposition"] = f'attachment; filename="{filename}"'
+
+        return response
     except ValueError:
         return 403, {
             "message": f"Exporting Package with id {q.package_uuid} failed due to insufficient rights!"