Mount /dev/shm for shared memory files

[kerthcet]

What would you like to be added:

This is how it should look like:

    volumeMounts:
    - mountPath: /dev/shm
      name: dshm

But this memory size is unknown.

Why is this needed:

Accelerate model loading and model inference.

Completion requirements:

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[kerthcet]

/kind feature