YAML definition of jnlp container isn't updated with env variables and arguments

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      Hi, thanks for adding yaml support. But i got in trouble while defining my custom jnlp container. I defined it like bellow, but the arguments and environment variables (secret, worker/pod name) won't be added to the definition, when the pod is scheduled.

      Pipeline definition

      def label = "buildpod-${UUID.randomUUID().toString()}"
podTemplate(
  label: label,
  yaml: """
apiVersion: v1
kind: Pod
metadata:
  labels:
    jenkins: slave
    jenkins/testbuild2: "true"
spec:
  containers:
  - name: buildenv
    command:
    - cat
    image: dr:5000/admin/buildenv:161
    imagePullPolicy: Always
    securityContext:
      privileged: false
    tty: true
  - name: jnlp
    image: dr:5000/base/jenkins_jnlp_slave:3.18
    imagePullPolicy: Always
    securityContext:
      privileged: false
    tty: true
  automountServiceAccountToken: false
"""
)

      YAML definition of scheduled jenkins slave pod:

      Containers:
  buildenv:
    Container ID:  
    Image:         dr:5000/admin/buildenv:161
    Image ID:      
    Port:          <none>
    Host Port:     <none>
    Command:
      cat
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /home/jenkins from workspace-volume (rw)
  jnlp:
    Container ID:   
    Image:          dr:5000/base/jenkins_jnlp_slave:3.18
    Image ID:       
    Port:           <none>
    Host Port:      <none>
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /home/jenkins from workspace-volume (rw)

      I expect the pod defined like this:

        jnlp:
    Container ID:  docker://aee29ef4c754c60a819c069dc74c26d32dc9fe038eceac94e2e1eda3f630bea0
    Image:         dr:5000/base/jenkins_jnlp_slave:3.18
    Image ID:      docker-pullable://dr:5000/base/jenkins_jnlp_slave@sha256:9e30352e9f0790f6d5b947d22245bb6d13fa6bb4f138a0b8e30043bbc099bd81
    Port:          <none>
    Host Port:     <none>
    Args:
      x
      jenkins-slave-txzpb-zl5s9
    State:          Running
      Started:      Tue, 03 Apr 2018 10:53:13 +0200
    Ready:          True
    Restart Count:  0
    Environment:
      JENKINS_SECRET:  x
      JENKINS_NAME:    jenkins-slave-txzpb-zl5s9
      JENKINS_URL:     http://y:8080/
      HOME:            /home/jenkins

            Assignee:
            Carlos Sanchez
            Reporter:
            Stephan Kirsten
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: