Add Dockerfile

Dockerfile

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+FROM       ubuntu
+MAINTAINER Johannes 'fish' Ziemke <[email protected]> @discordianfish
+
+RUN        apt-get update && apt-get install -yq curl git mercurial gcc
+RUN        curl -s https://go.googlecode.com/files/go1.2.linux-amd64.tar.gz | tar -C /usr/local -xzf -
+ENV        PATH    /usr/local/go/bin:$PATH
+ENV        GOPATH  /go
+
+ADD        . /usr/src/nginx_exporter
+RUN        cd /usr/src/nginx_exporter && \
+           go get -d && go build && cp nginx_exporter /
+
+ENTRYPOINT [ "/nginx_exporter" ]
+EXPOSE     8080