Allow option to use locally cached images when building images

[sondavidb]

What is the problem you're trying to solve

When building an image, I sometimes use local images that are not up to date with the tagged version in remote, but nerdctl will automatically pull from remote when it is out of date.

Describe the solution you'd like

I would like to be able to choose whether or not nerdctl pulls from remote. Currently, it uses buildkit's default, which for me is pulling from remote.

Additional context

No response