task distribution {
    doLast {
        println "We build the zip with version=$version"
    }
}

task release(dependsOn: 'distribution') {
    doLast {
        println 'We release now'
    }
}

gradle.taskGraph.whenReady {taskGraph ->
    if (taskGraph.hasTask(release)) {
        version = '1.0'
    } else {
        version = '1.0-SNAPSHOT'
    }
}