[CORD-2188] Create xos-gui-builder as a shared base image for all the UI containers

Change-Id: I571a50634f1a601ffec838769375761ef760a768
diff --git a/Dockerfile b/Dockerfile
index 7894b94..9f39abf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,14 @@
 # xosproject/xos-gui
-# To build use: docker build -f Dockerfile -t xosproject/xos-gui .
+# To build use: docker build -f Dockerfile -t xosproject/xos-gui:candidate . (note that this require xos-gui-extension-builder to be built)
 # To run use: docker run -p 4000:4000 --volumes-from gui-extensions-store -d xosproject/xos-gui
-FROM node:7.9.0 as xos-gui-base
 
-# Set environment vars
+# xos-gui-base container
+FROM xosproject/xos-gui-builder:candidate as xos-gui-base
+
 ENV CODE_SOURCE .
 ENV CODE_DEST /var/www
 ENV VHOST /var/www/dist
 
-# copy over files
 COPY ${CODE_SOURCE}/package.json \
      ${CODE_SOURCE}/typings.json \
      ${CODE_SOURCE}/gulpfile.js \
@@ -19,13 +19,13 @@
 COPY ${CODE_SOURCE}/gulp_tasks/ ${CODE_DEST}/gulp_tasks/
 COPY ${CODE_SOURCE}/src/ ${CODE_DEST}/src/
 
-# Install deps and build
 WORKDIR ${CODE_DEST}
 RUN npm install \
  && npm run typings \
  && npm run build
 
 
+# xos-gui container
 FROM nginx:candidate
 
 ENV CODE_SOURCE .
@@ -33,19 +33,14 @@
 
 WORKDIR ${VHOST}
 
-# create logdir
 RUN mkdir -p /var/log/nginx/log
 
-# Override nginx configutaion
 COPY ${CODE_SOURCE}/nginx.conf /etc/nginx/conf.d/default.conf
 
-# Copy minified app
 COPY --from=xos-gui-base ${VHOST} .
 
-# expose the app port
 EXPOSE 4000
 
-# Label image
 ARG org_label_schema_schema_version=1.0
 ARG org_label_schema_name=xos-gui
 ARG org_label_schema_version=unknown