Add Docker container

- need to format filesystem before testing.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

base/docker/Dockerfile

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+FROM alpine:3.5
+
+# Docker daemon only minimal Alpine install
+
+# set up subuid/subgid so that "--userns-remap=default" works out-of-the-box
+RUN set -x \
+	&& addgroup -S dockremap \
+	&& adduser -S -G dockremap dockremap \
+	&& echo 'dockremap:165536:65536' >> /etc/subuid \
+	&& echo 'dockremap:165536:65536' >> /etc/subgid
+
+# https://github.com/docker/docker/blob/master/project/PACKAGERS.md#runtime-dependencies
+RUN apk add --no-cache \
+	ca-certificates \
+	curl \
+	iptables \
+	xz
+
+# removed xfsprogs e2fs btrfs as we do not support dm or btrfs yet
+# removed openssl as I do not think server needs it
+
+ENV DOCKER_BUCKET get.docker.com
+ENV DOCKER_VERSION 17.03.0-ce
+ENV DOCKER_SHA256 4a9766d99c6818b2d54dc302db3c9f7b352ad0a80a2dc179ec164a3ba29c2d3e
+
+# we could avoid installing client here I suppose
+RUN set -x \
+	&& curl -fSL "https://${DOCKER_BUCKET}/builds/Linux/x86_64/docker-${DOCKER_VERSION}.tgz" -o docker.tgz \
+	&& echo "${DOCKER_SHA256} *docker.tgz" | sha256sum -c - \
+	&& tar -xzvf docker.tgz \
+	&& mv docker/* /usr/bin/ \
+	&& rmdir docker \
+	&& rm docker.tgz \
+	&& docker -v
+
+ENTRYPOINT ["/usr/bin/docker-init", "/usr/bin/dockerd"]

base/docker/Makefile

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+.PHONY: tag push
+
+BASE=alpine:3.5
+IMAGE=docker
+
+default: push
+
+hash: Dockerfile
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --entrypoint /bin/sh --rm $(IMAGE):build -c 'cat Dockerfile /lib/apk/db/installed | sha1sum' | sed 's/ .*//' > $@
+
+push: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		(docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash) && \
+		 docker push mobylinux/$(IMAGE):$(shell cat hash))
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+tag: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash)
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+clean:
+	rm -f hash
+
+.DELETE_ON_ERROR: