Another fix for docker-publish job.

Change-Id: I26b03992c1ed8bafe6d5bdf99c733c8ceb1a468e
diff --git a/jjb/pipeline/docker-publish.groovy b/jjb/pipeline/docker-publish.groovy
index 9f059f0..fb00990 100644
--- a/jjb/pipeline/docker-publish.groovy
+++ b/jjb/pipeline/docker-publish.groovy
@@ -25,7 +25,7 @@
       steps {
         checkout([
           $class: 'GitSCM',
-          userRemoteConfigs: [[ url: "${params.gitUrl}", credentialsId:'${params.credentialsId}']],
+          userRemoteConfigs: [[ url: "${params.gitUrl}", credentialsId: "${params.credentialsId}"]],
           branches: [[ name: "${params.gitRef}", ]],
           extensions: [
             [$class: 'WipeWorkspace'],