The Quarkus Gradle plugin is published to the Gradle Plugin Portal.

To use it, add the following to your build.gradle file:

plugins {
    id 'java'
    id 'io.quarkus'
}

You also need to add the following at the top of your settings.gradle file:

pluginManagement {
    repositories {
        mavenCentral()
        gradlePluginPortal()
    }
    plugins {
      id 'io.quarkus' version "${quarkusPluginVersion}"
    }
}
NOTE

the plugins{} method in settings.gradle is not supported in Gradle 5.x. In this case make sure to explicitly declare the plugin version in the build.gradle file like the example below:

plugins {
    id 'java'
    id 'io.quarkus' version '2.12.0.Final'
}