k8s follow-up - Ability to set remote-copy-back option globally

[davidferlay]

Context

• Followup of k8s support which introduces container.runtime: kubernetes

Observed

• New option --remote-copy-back has to be added as option to any command requiring it
• There may be cases or environments where this option is always required for action to execute as expected (like CI environments)

Expected

• Would be great to have a way to set --remote-copy-back true globally, both:
  • using either an env var
  • using a key in .config file