Expose PR base ref (master, release-1.5, etc) for batch system to use.
Expose PR base ref (master, release-1.5, etc) for batch system to use.

verb/contrib,x13n/contrib,widgetpl/contrib,widgetpl/contrib,foxish/contrib,verb/contrib,cdemers/contrib,widgetpl/contrib,olark/kubernetes-contrib,xialonglee/contrib,x13n/contrib,cdemers/contrib,moul/contrib,moul/contrib,kskalski/contrib,Q-Lee/contrib,Q-Lee/contrib,kskalski/contrib,Q-Lee/contrib,rmmh/kubernetes-contrib,piosz/contrib,spxtr/contrib,luxas/contrib,ixdy/kubernetes-contrib,cdemers/contrib,thockin/contrib,grodrigues3/contrib,kow3ns/contrib,grodrigues3/contrib,eastbanctech/kubernetes-contrib,kow3ns/contrib,cdemers/contrib,ixdy/kubernetes-contrib,foxish/contrib,rchicoli/kubernetes-contrib,luxas/contrib,foxish/contrib,Pensu/contrib,verb/contrib,spxtr/contrib,ixdy/contrib,rchicoli/kubernetes-contrib,ixdy/kubernetes-contrib,aledbf/contrib,ingvagabund/contrib,spxtr/contrib,spxtr/contrib,olark/kubernetes-contrib,ingvagabund/contrib,luxas/contrib,xialonglee/contrib,piosz/contrib,thockin/contrib,Pensu/contrib,verb/contrib,rmmh/kubernetes-contrib,krzyzacy/contrib,kow3ns/contrib,ixdy/kubernetes-contrib,Pensu/contrib,kow3ns/contrib,widgetpl/contrib,aledbf/contrib,grodrigues3/contrib,eastbanctech/kubernetes-contrib,grodrigues3/contrib,luxas/contrib,ixdy/kubernetes-contrib,ixdy/contrib,jcmoraisjr/k8s-contrib,jcmoraisjr/k8s-contrib,rmmh/kubernetes-contrib,kskalski/contrib,foxish/contrib,jcmoraisjr/k8s-contrib,kskalski/contrib,Q-Lee/contrib,moul/contrib,luxas/contrib,eastbanctech/kubernetes-contrib,spxtr/contrib,rchicoli/kubernetes-contrib,olark/kubernetes-contrib,xialonglee/contrib,ixdy/kubernetes-contrib,ingvagabund/contrib,ixdy/contrib,aledbf/contrib,krzyzacy/contrib,foxish/contrib,kow3ns/contrib,rchicoli/kubernetes-contrib,kskalski/contrib,x13n/contrib,verb/contrib,ingvagabund/contrib,rmmh/kubernetes-contrib,krzyzacy/contrib,foxish/contrib,jcmoraisjr/k8s-contrib,piosz/contrib,aledbf/contrib,moul/contrib,xialonglee/contrib,luxas/contrib,Pensu/contrib,piosz/contrib,olark/kubernetes-contrib,Q-Lee/contrib,rchicoli/kubernetes-contrib,olark/kubernetes-contrib,piosz/contrib,aledbf/contrib,piosz/contrib,x13n/contrib,Q-Lee/contrib,thockin/contrib,cdemers/contrib,kskalski/contrib,xialonglee/contrib,eastbanctech/kubernetes-contrib,aledbf/contrib,rmmh/kubernetes-contrib,Pensu/contrib,spxtr/contrib,eastbanctech/kubernetes-contrib,moul/contrib,krzyzacy/contrib,ingvagabund/contrib,krzyzacy/contrib,ingvagabund/contrib,widgetpl/contrib,rmmh/kubernetes-contrib,verb/contrib,xialonglee/contrib,thockin/contrib,widgetpl/contrib,x13n/contrib,grodrigues3/contrib,krzyzacy/contrib,kow3ns/contrib,grodrigues3/contrib,jcmoraisjr/k8s-contrib,x13n/contrib,Pensu/contrib,cdemers/contrib,jcmoraisjr/k8s-contrib,rchicoli/kubernetes-contrib,thockin/contrib,eastbanctech/kubernetes-contrib,thockin/contrib,olark/kubernetes-contrib