fix(docker-google-cloud): Update docker build process to allow Google Cloud CLIENT_ID to be passed in at runtime, update docs. (#651)

Dockerfile

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+# This dockerfile is used to publish the `ohif/viewer` image on dockerhub.
+#
+# It's a good example of how to build our static application and package it
+# with a web server capable of hosting it as static content.
+#
+# docker build
+# --------------
+# If you would like to use this dockerfile to build and tag an image, make sure
+# you set the context to the project's root directory:
+# https://docs.docker.com/engine/reference/commandline/build/
+#
+#
+# SUMMARY
+# --------------
+# This dockerfile has two stages:
+#
+# 1. Building the React application for production
+# 2. Setting up our Nginx (Alpine Linux) image w/ step one's output
+#
+
+
+# Stage 1: Build the application
+# docker build -t ohif/viewer:latest .
+FROM node:11.2.0-slim as builder
+
+# RUN apt-get update && apt-get install -y git yarn
+RUN mkdir /usr/src/app
+WORKDIR /usr/src/app
+
+COPY package.json /usr/src/app/package.json
+COPY yarn.lock /usr/src/app/yarn.lock
+
+# Run the install before copying the rest of the files
+RUN yarn install
+
+ENV PATH /usr/src/app/node_modules/.bin:$PATH
+ENV GENERATE_SOURCEMAP=false
+ENV REACT_APP_CONFIG=config/default.js
+
+# White list instead of copying the whole directory
+COPY src /usr/src/app/src
+COPY public /usr/src/app/public
+COPY .babelrc /usr/src/app/.babelrc
+COPY .eslintrc /usr/src/app/.eslintrc
+
+RUN yarn run build:web
+
+# Stage 2: Bundle the built application into a Docker container
+# which runs Nginx using Alpine Linux
+FROM nginx:1.15.5-alpine
+RUN apk add --no-cache bash
+RUN rm -rf /etc/nginx/conf.d
+COPY docker/Viewer-v2.x /etc/nginx/conf.d
+COPY docker/Viewer-v2.x/entrypoint.sh /usr/src/
+RUN chmod 777 /usr/src/entrypoint.sh
+COPY --from=builder /usr/src/app/build /usr/share/nginx/html
+EXPOSE 80
+EXPOSE 443
+ENTRYPOINT ["/usr/src/entrypoint.sh"]
+CMD ["nginx", "-g", "daemon off;"]