add dcos cli

Signed-off-by: Jess Frazelle <jess@mesosphere.com>

dcos-cli/Dockerfile

@@ -0,0 +1,14 @@
+FROM alpine:latest
+MAINTAINER Jessica Frazelle <jess@docker.com>
+
+RUN apk update && apk add \
+	ca-certificates \
+	python \
+	py-pip \
+	&& rm -rf /var/cache/apk/* \
+	&& pip install dcoscli
+
+# path to the DCOS CLI binary
+RUN echo 'export PATH=$PATH:/dcos/bin;' >> ~/.bashrc
+
+ENTRYPOINT [ "dcos" ]