Build RedHat git19 software collection
$> docker build -t git19 .
$> docker run --name=git19 git19 true
$> docker cp git19:/home/builder/rpmbuild/RPMS $PWD
$> docker rm git19
$> copy the package & setup yum repo
$> yum install git19-git
$> /opt/rh/git19/root/usr/bin/git --version