pass in optional GITCOMMIT override
pass in optional GITCOMMIT override

Signed-off-by: Andrew Hsu <f92968afc12903b4e22dfb0d2a8d9823100da266@docker.com>

docker/cli,e11137/cli,ashfall/cli,riyazdf/cli,allencloud/cli,dnephin/cli,docker/cli,Zebrilee/cli,redpanda/cli,thaJeztah/cli,riyazdf/cli,e11137/cli,cpuguy83/cli,cpuguy83/cli,ashfall/cli,allencloud/cli,dnephin/cli,Zebrilee/cli,redpanda/cli,thaJeztah/cli