adds missing variable

build-factario-container.jenkins

@@ -1,6 +1,7 @@
 def label = "jenkins-${UUID.randomUUID().toString()}"
 
 def repository = "registry.test-chamber-13.lan"
+def repositoryCreds = "quay-repository-creds"
 def kanikoImage = "${repository}/nhyatt/kaniko:latest"
 def imageName = "nhyatt/factorio"
 def imageTag = "latest"