Add dockerfile (from lmenezes/cerebro#304)

Dockerfile

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+FROM openjdk:8-jre-alpine
+
+ENV CEREBRO_VERSION 0.8.1
+
+RUN apk add --no-cache bash \
+ && mkdir -p /opt/cerebro/logs \
+ && wget -qO- https://github.com/lmenezes/cerebro/releases/download/v${CEREBRO_VERSION}/cerebro-${CEREBRO_VERSION}.tgz \
+  | tar xzv --strip-components 1 -C /opt/cerebro \
+ && sed -i '/<appender-ref ref="FILE"\/>/d' /opt/cerebro/conf/logback.xml \
+ && addgroup -g 1000 cerebro \
+ && adduser -D -G cerebro -u 1000 cerebro \
+ && chown -R cerebro:cerebro /opt/cerebro
+
+WORKDIR /opt/cerebro
+EXPOSE 9000
+USER cerebro
+ENTRYPOINT [ "/opt/cerebro/bin/cerebro" ]

README.md

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+cerebro-docker
+--------------
+
+cerebro-docker contains the official docker files for [cerebro](https://github.com/lmenezes/cerebro) 
+