When I try to override the jnlp container image I still always get the alpine image and do not get the specified image. It seems that event hough i specify a container with the name jnlp it just ignores it and uses the default alpine image.

agent {
  kubernetes {
    label "human-review-ui-pipeline-${env.BUILD_ID}"
    defaultContainer 'jnlp'
    yaml """
apiVersion: v1
kind: Pod
metadata:
{{ labels:}}
{{ pod-template: jenkins-slave-npm}}
spec:
{{ containers:}}
{{ - name: jnlp}}
  image: "redhat-cop/jenkins-slave-image-mgmt"

"""