如何使用Android Gradle插件3.0.0+操作不同的输出？

android {
    buildTypes {
        debug {
            // 调试配置
            debuggable true
            minifyEnabled false
        }
        release {
            // 发布配置
            debuggable false
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

android {
    flavorDimensions "version"
    productFlavors {
        free {
            // 免费版配置
            applicationId "com.example.free"
            resValue "string", "app_name", "Free App"
        }
        paid {
            // 付费版配置
            applicationId "com.example.paid"
            resValue "string", "app_name", "Paid App"
        }
    }
}

./gradlew assembleDebugFree

./gradlew assembleReleasePaid