Add in-memory capacity for TaskRunner Process and Docker

[thomas-depierre]

Feature description

Today, we moved the "/tmp/kestra-wd" folder to a tmpfs to take advantage of in-memory performance. Would it be possible to also offer this capability to runners (Process and Docker at least) to benefit from these same advantages?
Example:

  type: io.kestra.plugin.scripts.shell.Script
  taskRunner:
    type: io.kestra.plugin.scripts.runner.docker.Docker / type: io.kestra.plugin.core.runner.Process
    pullPolicy: IF_NOT_PRESENT
    cpu:
      cpus: 1
    memory:
      memory: 512Mi
    volume:
      inMemory: true
      limit: 8G