Multiple stage go / javascript build

Dockerfile

FROM golang:1.10 as builder
WORKDIR /workplace/
COPY src .
RUN go get gopkg.in/redis.v3
RUN CGO_ENABLED=0 GOOS=linux go build -o ./server

FROM node:6-alpine as minifier
WORKDIR /workplace/
COPY assets .
RUN npm install -g minifier
RUN minifier

FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /workplace/server .
COPY --from=minifier /workplace/ .

CMD ["./server"]

EXPOSE 8080