Docker Build confd and packages into nginx alpine

Dockerfile

# BUILD CONFD STAGE
#
	FROM golang:1.8.3-alpine3.6 AS confd-build-stage
	WORKDIR /go/src/github.com/kelseyhightower
	RUN apk --update add git bash
	RUN git clone --depth 1 https://github.com/kelseyhightower/confd.git \
	    && cd confd \
	    && ./build \
	    && chmod +x bin/confd
	RUN mkdir -p /etc/confd/conf.d /etc/confd/templates


# PACKAGING STAGE
#
	FROM nginx:alpine
	COPY --from=confd-build-stage /go/src/github.com/kelseyhightower/confd/bin/confd /usr/local/bin/
	COPY --from=confd-build-stage /etc/confd/ /etc/confd/
	COPY ./nginx-confd.sh /usr/local/bin/nginx-confd
	VOLUME /etc/confd

	CMD ["nginx-confd"]