Add Quarkus chapter in upgrade guide

Author: tltv

articles/upgrading/index.adoc

@@ -323,6 +323,11 @@ If you're using a Gradle wrapper, update it to version 8.14 by executing the fol
 
 For Java 21 compatibility, you may need to update the `sourceCompatibility` setting in your project's build file to version 21. Check your project's build file and make any necessary changes.
 
+== Quarkus
+
+Vaadin Quarkus extension is changed to build production package by default. No need for production profile with exclusions for development tools in Maven configurations because Vaadin Quarkus extension has build-in Vaadin plugin handling production packaging.
+
+To allow project to keep build configuration unchanged, Vaadin Quarkus extension has `vaadin.build.enabled` property to change the default behaviour. Disable Vaadin plugin by adding `vaadin.build.enabled=false` in `application.properties` file to keep using profile based configuration.
 
 == Removed Deprecations