Fix docker push command to include registry in image path

vars/dockerPush.groovy

@@ -17,7 +17,7 @@ def call(Map args = [:]) {
             sh "echo \$DOCKER_PASS | docker login ${registry} -u \$DOCKER_USER --password-stdin"
 
             echo "Pushing Docker image: ${imageName}"
-            sh "docker push ${imageName}"
+            sh "docker push ${args.registry}/${imageName}"
             }
     }
 }