Reproduce inconsistent sha output for docker2aci

test-sha.sh

#!/bin/bash
set -euo pipefail

for i in $(seq 1 20); do
	mkdir "fetch-$i"
	pushd "fetch-$i"
	../bin/docker2aci docker://euank/manylabels:busybox
	sudo rkt fetch --insecure-options=image *.aci > sha
	sudo rkt image cat-manifest $(cat sha) > rktmanifest
	cat *.aci | gunzip | tar x
	popd
done

cat "fetch-"*/sha | sort | uniq -c