Pass CI_REGISTRY_IMAGE to ascn build

I hope this works

container/Dockerfile.ascn

-FROM varnish-ingress/klarlack
+ARG CI_REGISTRY_IMAGE
+FROM $CI_REGISTRY_IMAGE/varnish-ingress/klarlack
+
+varnish-ingress/klarlack
 
 RUN apt-get remove -y -q curl gnupg && \
     apt-get autoremove -y -q && \

container/Makefile

@@ -55,6 +55,7 @@ klarlack: Dockerfile.klarlack docker-minikube
 
 ascn: Dockerfile.ascn docker-minikube
 	docker build $(DOCKER_BUILD_OPTIONS) -t $(IMAGE_REPO)varnish-ingress/ascn \
+	--build-arg CI_REGISTRY_IMAGE=$(CI_REGISTRY_IMAGE) \
 	-f Dockerfile.ascn .
 
 haproxy: Dockerfile.haproxy docker-minikube