[#1095] Sign the artifacts for Sonatype

publish.gradle

@@ -127,7 +127,7 @@ gradle.taskGraph.whenReady { TaskExecutionGraph graph ->
     else {
         // signing was not explicitly requested and we are not publishing to OSSRH,
         // 		- disable all Sign tasks
-        tasks.withType( Sign ).each { enabled = false }
+        tasks.withType( Sign ).each { t-> t.enabled = false }
     }
 }