Trigger Travis CI builds within Drupal.
Why? Perhaps you have a static site/app which uses the Drupal CMS as it's content souce. You build/deploy the static app automatically, normally after successful tests upon a commit to master via the Travis continuous integration tool to some web host. Now you can use Drupal events (via Rules) to rebuild and deploy when: content is updated, you clear cache, on cron, or whenever.
"Headless Drupal is so hot right now."