fix: support headfull mode in puppeteer js project template

Author: B4nan

packages/templates/templates/puppeteer-js/Dockerfile

@@ -25,5 +25,6 @@ RUN npm --quiet set progress=false \
 COPY --chown=myuser . ./
 
 
-# Run the image.
-CMD npm start --silent
+# Run the image. If you know you won't need headful browsers,
+# you can remove the XVFB start script for a micro perf gain.
+CMD ./start_xvfb_and_run_cmd.sh && npm run start:prod --silent