do not switch to a tech-preview dist-git branch
do not switch to a tech-preview dist-git branch

we are going to put tech-preview images in the same branch as their
regular cousins.

Signed-off-by: Jonathan Dowland <c0ba515c40872faa4125f492781ab4f735e85bcc@redhat.com>

goldmann/dogen,goldmann/dogen,goldmann/dogen