Multi-stage docker for node apps

Dockerfile

# ---- Base image ----
FROM node:8.9.4 AS base
RUN JOBS=MAX npm set progress=false && npm config set depth 0
WORKDIR /workdir
COPY /package*.json .
COPY /.npmrc .

# ---- Build ----
FROM base AS build
ARG NPM_TOKEN
WORKDIR /workdir
COPY . .
RUN npm run build
RUN npm prune --production

# ---- Release ----
FROM node:8.9.4-slim AS release
WORKDIR /workdir
COPY --from=build /workdir/. /workdir/
EXPOSE 3000
CMD ["node", "index.js"]