Pass generic http proxy for image pulls

What is the problem you're trying to solve

We are wanting to use a generic proxy for container image pulls. I understand the common method is to set http_proxy in the service before start. However, we only want image pulls to use this proxy and nothing else that containerd and it's children may do.

Describe the solution you'd like

Ability to set a proxy just for container image pulls.

Additional context

No response