[jenkins] Initial commit of self-upgrading Jenkins

jenkins/Dockerfile

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+FROM itzg/ubuntu-openjdk-7
+
+MAINTAINER itzg
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install curl && apt-get clean
+
+ADD download-and-start.sh /download-and-start
+
+ENV JENKINS_HOME /data
+VOLUME ["/data"]
+EXPOSE 8080
+
+CMD ["/download-and-start"]