Publish .aar file to Apache Archiva with Gradle

apply plugin: 'com.android.library'
apply plugin: 'maven'
apply plugin: 'maven-publish'
android {
compileSdkVersion 21
buildToolsVersion "21.1.2"


repositories {
    mavenCentral()
}

defaultConfig {
    minSdkVersion 9
    targetSdkVersion 21
    versionCode 1
    versionName "1.0"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}


dependencies {
   compile fileTree(include: ['*.jar'], dir: 'libs')
   provided 'com.android.support:support-v4:21.0.3'
   provided 'com.android.support:appcompat-v7:21.0.3'
}

task sourceJar(type: Jar) {
   classifier "source"
}

publishing {
   publications {

       repositories.maven {
           url 'myurl/repositories/myrepo'
           credentials {
               username "user"
               password "password"
           }
       }

       maven(MavenPublication) {
           artifacts {
               groupId 'com.mycompany'
               artifactId 'mylibrary'
               version '1.0'
               artifact 'build/outputs/aar/app-release.aar'
           }
       }
   }

}