Add downloader container image

Author: kamalmarhubi

builder/downloader/Dockerfile

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+FROM gcr.io/absolute-realm-611/kubereview-base
+COPY download.sh download.sh
+ENTRYPOINT ["/download.sh"]

builder/downloader/download.sh

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+#!/bin/sh
+
+set -eu
+set -x
+
+mkdir -p /tmp/extracted
+wget -O /tmp/out.zip "$1"
+unzip -d /tmp/extracted /tmp/out.zip
+unset dir
+# GitHub zip files always have an inner directory with a name based on repo /
+# ref. Assume it's the only one and give it a known name.
+dir="$(ls /tmp/extracted)"
+mv "/tmp/extracted/$dir" /workspace/src

docker/base/Dockerfile

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+FROM alpine
+RUN apk update && apk add openssl ca-certificates