Removed Gradle signing plugin

Our Jenkins instance has been confirmed to handle signing.

Author: rjrudin

flux-cli/build.gradle

@@ -5,7 +5,6 @@ plugins {
   id "org.sonarqube" version "4.4.1.3373"
   id 'com.github.johnrengelman.shadow' version '8.1.1'
   id 'maven-publish'
-  id 'signing'
 }
 
 configurations {
@@ -280,15 +279,6 @@ publishing {
   }
 }
 
-// Per https://docs.gradle.org/current/userguide/signing_plugin.html#sec:conditional_signing .
-//ext.isReleaseVersion = !version.endsWith("SNAPSHOT")
-// Temporarily disabling signing.
-ext.isReleaseVersion = false
-signing {
-  required { isReleaseVersion }
-  sign publishing.publications.mainJava
-}
-
 // Multiple shadow plugin users have requested the ability to not have the shadow jar published by default. This
 // does the trick for that. See https://docs.gradle.org/current/userguide/publishing_customization.html .
 // Also see https://github.com/johnrengelman/shadow/issues/586#issuecomment-70837559 for the shadow jar issue.

gradle.properties

@@ -5,9 +5,6 @@ version=1.0.0
 mavenCentralUsername=
 mavenCentralPassword=
 mavenCentralUrl=https://oss.sonatype.org/service/local/staging/deploy/maven2/
-#signing.keyId=YourKeyId
-#signing.password=YourPublicKeyPassword
-#signing.secretKeyRingFile=PathToYourKeyRingFile
 
 # For publishing to internal Nexus repository
 publishUrl=file:../releases