Cleanup of docker images

test/e2e-prow/Makefile

@@ -1,19 +0,0 @@
-TAG ?=v$(shell date +%m%d%Y)-$(shell git rev-parse --short HEAD)
-REGISTRY ?= quay.io/kubernetes-ingress-controller
-DOCKER ?= docker
-
-IMAGE = $(REGISTRY)/e2e-prow
-
-all: docker-build docker-push
-
-docker-build:
-	$(DOCKER) build \
-		--pull \
-		--build-arg K8S_RELEASE=v1.15.0 \
-		--build-arg ETCD_VERSION=v3.3.12 \
-		-t $(IMAGE):$(TAG) .
-
-docker-push:
-	$(DOCKER) push $(IMAGE):$(TAG)
-	$(DOCKER) tag $(IMAGE):$(TAG) $(IMAGE):latest
-	$(DOCKER) push $(IMAGE):latest