Merge pull request #48 from caseydavenport/casey-fix-cd

Fix make cd target to use correct tag for docker images

Makefile

@@ -180,7 +180,7 @@ ifndef BRANCH_NAME
 	$(error BRANCH_NAME is undefined - run using make <target> BRANCH_NAME=var or set an environment variable)
 endif
 	$(MAKE) tag-images-all push-all push-manifests push-non-manifests IMAGETAG=${BRANCH_NAME} EXCLUDEARCH="$(EXCLUDEARCH)"
-	$(MAKE) tag-images-all push-all push-manifests push-non-manifests IMAGETAG=$(shell git describe --tags --dirty --always --long) EXCLUDEARCH="$(EXCLUDEARCH)"
+	$(MAKE) tag-images-all push-all push-manifests push-non-manifests IMAGETAG=${GIT_VERSION} EXCLUDEARCH="$(EXCLUDEARCH)"
 
 ###############################################################################
 # Release