Strip newlines from captured keygrip

Change-Id: I58d199c6aa439bc887a596f9253040d70bd11cdd
diff --git a/cicd/pipelines/tasks/task_publish_unstable.jenkins b/cicd/pipelines/tasks/task_publish_unstable.jenkins
index c8cfb86..ece105d 100644
--- a/cicd/pipelines/tasks/task_publish_unstable.jenkins
+++ b/cicd/pipelines/tasks/task_publish_unstable.jenkins
@@ -11,7 +11,7 @@
 }
 
 String getFileContents(filename) {
-    return sh(returnStdout: true, script: "cat ${filename}")
+    return sh(returnStdout: true, script: "cat ${filename}").trim()
 }
 
 def workspacePath = "/home/jenkins/workspace"