Cannot declare an in-memory emptyDir volume through myvalues.yaml

As it seems to solve NXP-27559, we currently need to declare /tmp as a Kubernetes in-memory (mount a tmpfs) emptyDir volume.

We still need to investigate what's the issue with the ChronicleQueue tests when /tmp is not in a volume and why using such an in-memory emptyDir volume fixes it. It might not be the final solution but for now we need to be able to define such a volume in a Jenkins X PodTemplate.

We've tried the following in myvalues.yaml:

jenkins:
  Agent:
    PodTemplates:
      Maven-Java11-Nuxeo:
        Name: maven-java11-nuxeo
        Label: jenkins-maven-java11-nuxeo
        DevPodPorts: 5005, 8080
        volumes:
          - type: EmptyDir
            mountPath: /tmp

It does make appear a volume in the Jenkins X configuration UI, see attached screenshot, but:

• There doesn't seem to be a way to check the "In Memory" checkbox.
• Looking at the generated Kubernetes pod template config map, there is something missing, comparing the workspace volume (defined by default) and the tmp one:

        volumes:
        - name: workspace-volume
          emptyDir: {}
        - name: volume-3
        ...
        containers:
          volumeMounts:
            - name: workspace-volume
              mountPath: /home/jenkins
  
            ...
            - name: volume-3
              mountPath: /tmp