Resubmit 'b2stautau-HT'
b2stautau-HT
See merge request !131 (merged)
(cherry picked from commit 20d9ad85)
0053c3ff Added stage0 yaml
Resubmitting (again) due to memory consumption issues: https://its.cern.ch/jira/browse/LHCBGAUSS-2828
*First resubmission did not contain bugfix.