Added Debian Dockerfile.

FROM debian:stretch-slim as scratch

ENV GOSU_VERSION 1.10

RUN set -ex; \

	\

	fetchDeps=' \

		ca-certificates \

        dirmngr \

        gpg \

        gpg-agent \

		wget \

	'; \

	apt-get update; \

	apt-get install -y --no-install-recommends $fetchDeps; \

	rm -rf /var/lib/apt/lists/*; \

	\

	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \

	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \

	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \

	\

# verify the signature

	export GNUPGHOME="$(mktemp -d)"; \

	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \

	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \

	\

	chmod +x /usr/local/bin/gosu; \

# verify that the binary works

	gosu nobody true;

FROM debian:stretch-slim

COPY --from=scratch /usr/local/bin/gosu /usr/local/bin/