Make Dockerfile build prometheus in container

This way the binary will be built in a clear environment and prometheus
can be added to the docker index.

Change-Id: I417fb90adf2503c990a96f4bad370b09b102e0b9

Dockerfile

@@ -1,7 +1,10 @@
-# Cannot use busybox image since Prometheus depends on libc.
-FROM base
-
+FROM       ubuntu:13.10
 MAINTAINER Prometheus Team <prometheus-developers@googlegroups.com>
 EXPOSE     9090
-ENTRYPOINT ["/opt/prometheus/run_prometheus.sh"]
-ADD .build/package/ /opt/prometheus
+VOLUME     [ "/prometheus" ]
+WORKDIR    /prometheus
+
+ENTRYPOINT [ "/prometheus-src/.build/package/run_prometheus.sh" ]
+RUN        apt-get update && apt-get install -yq make git curl sudo mercurial
+ADD        . /prometheus-src
+RUN        cd /prometheus-src && make binary