New Dockerfile using alpine-golang-make-onbuild base image

Dockerfile

@@ -1,14 +1,4 @@
-FROM alpine:3.2
-MAINTAINER The Prometheus Authors <[email protected]>
-
-ENV GOPATH /go
-COPY . /go/src/github.com/prometheus/nginx_exporter
-
-RUN apk add --update -t build-deps go git mercurial make \
-    && apk add -u musl && rm -rf /var/cache/apk/* \
-    && cd /go/src/github.com/prometheus/nginx_exporter \
-    && make && cp nginx_exporter /bin/nginx_exporter \
-    && rm -rf /go && apk del --purge build-deps
+FROM        sdurrheimer/alpine-golang-make-onbuild
+MAINTAINER  The Prometheus Authors <[email protected]>
 
 EXPOSE     9113
-ENTRYPOINT [ "/bin/nginx_exporter" ]