Amend Docker setup to work with create react app

.dockerignore

@@ -0,0 +1,2 @@
+ui/node_modules
+.git

Dockerfile

@@ -1,18 +1,17 @@
 FROM mhart/alpine-node:latest
 
-ADD package.json /package.json 
-ADD webpack.config.js /webpack.config.js
+WORKDIR /ui
+
 ADD ui /ui
-# Install node deps
 RUN npm install
 
-# Build assets to ./dist
-RUN $(npm bin)/webpack
+# Build assets to ./ui/build
+RUN npm build
 
 # Run the image as a non-root user
 RUN adduser -D mrfusion
 USER mrfusion
 
-# Start the server. Currently this is just a webpack dev server
-# in the future we'd start the go process here.
-CMD $(npm bin)/webpack-dev-server --host 0.0.0.0 --port $PORT
+# Start the server.
+# in the future we'd start the go process here and serve the static assets in /build
+CMD npm start