[REQ] Investigate buildkit debugging support

[cpuguy83]

What kind of request is this?

None

What is your request or suggestion?

buildkit supports debugging for builds. This is implemented in via buildx debug.

When trying to use this functionality with dalec we get an error about a mount reference for the rootfs not being found. We should investigate this because it would be very nice to be able to drop into a failed build to see what happened.

Are you willing to submit PRs to contribute to this feature request?

• [ ] Yes, I am willing to implement it.