Support multiple build contexts
What is the problem you're trying to solve
Docker build supports multiple contexts with --build-context flag to build complex projects. This allows you to build a Dockerfile using multiple local directories. https://www.docker.com/blog/dockerfiles-now-support-multiple-build-contexts/
Similar issue in Finch: https://github.com/runfinch/finch/issues/821
Describe the solution you'd like
Add a --build-context flag to nerdctl build command.
Additional context
No response
Hey! I'm looking forward to start contributing to containerd projects. I'd like to get started with this one? (I'm already investigating the changes needed in the code base)
@mharwani, can this issue be closed with the implementation that was added in ~~#2835~~ #2861?
Implementation in #2861 resolves this. Closing the issue.