user python3 on runtests explicitly
user python3 on runtests explicitly

geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx,geometalab/osmaxx,geometalab/osmaxx,geometalab/osmaxx-frontend,geometalab/drf-utm-zone-info,geometalab/osmaxx,geometalab/drf-utm-zone-info