Hi @shehan since Gatsby generates static HTML at build time you do need to start a new build when additional pages are created in Builder. You can deploy your site to a platform like Netlify or Vercel for CI/CD then create a webhook that will automatically trigger builds every time new content is published from your users in Builder.
https://www.builder.io/c/docs/webhooks
https://forum.builder.io/t/integrate-builder-with-your-netlify-site-using-a-webhook/1238
https://forum.builder.io/t/avoid-having-to-stop-and-start-gatsbyjs-development-server-to-get-changes-from-builder-io/163