use symlink for Dockerfile

Dockerfile

-FROM node:8.2
-
-# Create app directory
-RUN mkdir -p /usr/src/app
-WORKDIR /usr/src/app
-
-RUN apt install -y git
-
-# use changes to package.json to force Docker not to use the cache
-# when we change our application's nodejs dependencies:
-ADD package.json /usr/src/app
-RUN npm install
-
-# Install app dependencies
-COPY . /usr/src/app
-RUN npm run build
-
-# Run the app in a local webserver
-RUN npm install -g serve
-EXPOSE 5000
-
-CMD [ "serve", "-s", "build" ]

Dockerfile

+packaging/docker/Dockerfile
\ No newline at end of file