docker image: multi-stage build

build in a golang-based container, then copy
resulting binaries into a minimal alpine-based container

Dockerfile

@@ -1,10 +1,26 @@
+FROM golang:latest AS build
+
+RUN mkdir -p /go/src/github.com/nsqio/nsq
+COPY . /go/src/github.com/nsqio/nsq
+
+WORKDIR /go/src/github.com/nsqio/nsq
+
+RUN wget -O /bin/dep https://github.com/golang/dep/releases/download/v0.3.2/dep-linux-amd64 \
+ && chmod +x /bin/dep \
+ && /bin/dep ensure \
+ && ./test.sh \
+ && CGO_ENABLED=0 make DESTDIR=/opt PREFIX=/nsq GOFLAGS='-ldflags="-s -w"' install
+
 FROM alpine:3.6
 
 EXPOSE 4150 4151 4160 4161 4170 4171
 
-VOLUME /data
-VOLUME /etc/ssl/certs
+# Optional volumes
+# /data - used for persistent storage across reboots
+# VOLUME /data
+# /etc/ssl/certs - directory for SSL certificates
+# VOLUME /etc/ssl/certs
 
-COPY dist/docker/bin/ /usr/local/bin/
+COPY --from=build /opt/nsq/bin/ /usr/local/bin/
 RUN ln -s /usr/local/bin/*nsq* / \
-    && ln -s /usr/local/bin/*nsq* /bin/
+ && ln -s /usr/local/bin/*nsq* /bin/