Add brubeck dockerfile

Dockerfile-brubeck

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+FROM ubuntu:14.04
+MAINTAINER Gregory Eremin <g@erem.in>
+LABEL app="brubeck"
+LABEL github="https://github.com/github/brubeck"
+
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update
+RUN apt-get install -y libjansson-dev
+RUN apt-get install -y libssl-dev
+RUN apt-get install -y libmicrohttpd-dev
+RUN apt-get install -y git
+RUN apt-get install -y make
+
+RUN mkdir /build
+RUN cd /build && git clone https://github.com/github/brubeck.git
+WORKDIR /build/brubeck
+RUN ./script/bootstrap
+
+COPY configs/brubeck.json /etc/brubeck.json
+EXPOSE 8080 8126 9126
+ENTRYPOINT ./brubeck --config=/etc/brubeck.json