Integrating an app on Bitrise with Appetize.io has been made easier with the release of a new version (0.9.0) of Dagio's Appetize.io deploy step, which is now rewritten in Go and provides more features than its previous version. The step allows users to configure parameters such as device scale, type, Android and iOS versions, and color before running their app in any browser. Users need to upload an .app file with the step, which sends it to Appetize and provides a URL for configuration and testing. To use this feature, users must provide specific files depending on the platform they are targeting, such as a `.zip` or `.tar.gz` file for iOS or the `.apk` file for Android.