Update to use alpine3.9 in PRs
Update to use alpine3.9 in PRs
ericstj/corefx,shimingsg/corefx,wtgodbe/corefx,ViktorHofer/corefx,wtgodbe/corefx,wtgodbe/corefx,ViktorHofer/corefx,shimingsg/corefx,shimingsg/corefx,shimingsg/corefx,shimingsg/corefx,BrennanConroy/corefx,ViktorHofer/corefx,wtgodbe/corefx,wtgodbe/corefx,wtgodbe/corefx,ViktorHofer/corefx,BrennanConroy/corefx,ViktorHofer/corefx,ericstj/corefx,shimingsg/corefx,ViktorHofer/corefx,shimingsg/corefx,ViktorHofer/corefx,ericstj/corefx,ericstj/corefx,BrennanConroy/corefx,ericstj/corefx,ericstj/corefx,ericstj/corefx,wtgodbe/corefx