feat(Makefile): set docker build flags via environment variable

mboersma · mboersma · commit a8c0fa7f5db6 · 2017-01-20T15:49:38.000-07:00
diff --git a/Makefile b/Makefile
@@ -17,7 +17,7 @@ clean: check-docker
 	docker rmi $(IMAGE)
 
 docker-build: check-docker
-	docker build --rm -t ${IMAGE} rootfs
+	docker build ${DOCKER_BUILD_TAGS} -t ${IMAGE} rootfs
 	docker tag ${IMAGE} ${MUTABLE_IMAGE}
 
 test:
