Add scratch image generation util

util-images/scratch/Dockerfile

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+FROM scratch
+ARG FILENAME
+
+COPY $FILENAME /

util-images/scratch/Makefile

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+PROJECT ?= k8s-testimages
+IMG = gcr.io/$(PROJECT)/perf-tests-util/scratch
+NUM_IMAGES ?= 20
+
+all: push
+
+build: Dockerfile
+	TAG=1 ; while [[ $$TAG -le $(NUM_IMAGES) ]] ; do \
+		touch $$TAG ; \
+		docker build --build-arg FILENAME=$$TAG -t $(IMG):$$TAG . ; \
+		rm $$TAG ; \
+		echo Built $(IMG):$$TAG ; \
+		((TAG = TAG + 1)) ; \
+	done
+
+.PHONY: push
+push: build
+	TAG=1 ; while [[ $$TAG -le $(NUM_IMAGES) ]] ; do \
+		docker push $(IMG):$$TAG ; \
+		echo Pushed $(IMG) with :$$TAG tags ; \
+		((TAG = TAG + 1)) ; \
+	done

util-images/scratch/README.md

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+# scratch
+
+Utility image for padding kubemark hosts to achieve more realistic node object sizes. Refer to issue https://github.com/kubernetes/kubernetes/issues/90833.
+
+## Releasing
+
+1. Configure the number of images to build / push.
+1. Build with `make build`
+1. Release with `make push`