uploadArchives {
   repositories {
        mavenDeployer {
            repository(url: 'http://nexus-host/nexus/content/releases/') {
                authentication(userName: System.getenv('RELEASE_USER'), password: System.getenv('RELEASE_PWD'));
            }
            snapshotRepository(url: 'http://nexus-host/nexus/content/snapshots/') {
                authentication(userName: System.getenv('SNAPSHOT_USER'), password: System.getenv('SNAPSHOT_PWD'));
            }
        }
    }
}

./gradlew uploadArchives