Multi stage docker build for NodeJS Service

Dockerfile

# installation step #
FROM node:lts-alpine3.9 AS builder
ENV BUILD_DIR /build
RUN mkdir -p $BUILD_DIR
WORKDIR $BUILD_DIR
COPY . $BUILD_DIR/
RUN npm install --no-audit
# if you have any build step, you should include that
# in this stage as well. e.g. npm run build

# package image step
FROM node:lts-alpine3.9 AS runtime  
EXPOSE 8080

# -- #
ENV APP_HOME /app
RUN mkdir -p $APP_HOME
WORKDIR $APP_HOME
COPY --from=builder /build ./
CMD ["npm", "start"]