Only run master org build if master org username env variable is set
Only run master org build if master org username env variable is set

SalesforceFoundation/CumulusCI,steelbrick/CumulusCI,cdcarter/CumulusCI,motivislearning/CumulusCI,motivislearning/CumulusCI,jorrit-steporange/CumulusCI,steelbrick/CumulusCI,roundcorner-products/CumulusCI,e02d96ec16/CumulusCI,ddrezga/CumulusCI,Joble/CumulusCI,jorrit-steporange/CumulusCI,e02d96ec16/CumulusCI,ddrezga/CumulusCI,roundcorner-products/CumulusCI,SalesforceFoundation/CumulusCI