Update CI Dockerfile to use new build tooling

awx/ui_next/Dockerfile

@@ -5,16 +5,13 @@ ARG TARGET_HOST='awx'
 ENV TARGET_HOST=${TARGET_HOST}
 ARG TARGET_PORT=8043
 ENV TARGET_PORT=${TARGET_PORT}
+ENV CI=true
 WORKDIR /ui_next
-ADD build build
-ADD dist dist
-ADD images images
+ADD public public
 ADD package.json package.json
 ADD package-lock.json package-lock.json
 COPY ${NPMRC_FILE} .npmrc
 RUN npm install
-ADD babel.config.js babel.config.js
-ADD webpack.config.js webpack.config.js
 ADD src src
 EXPOSE 3001
-CMD [ "npm", "run", "start" ]
+CMD [ "npm", "start" ]