Add support for BUILDKIT_SANDBOX_HOSTNAME for docker driver

[ShemTovYosef]

Are there any plans to do this, such that the default "docker" driver can have this functionality?
Otherwise, I have to teach my users about creating and using a buildx builder (which apparently needs to be a manual step before one launches Docker Compose, for example).

[tonistiigi]

It will come when buildkit is updated in Docker daemon. We don't rewrite features independently.

[ShemTovYosef]

Hi @tonistiigi
Could you describe the process ?
How can I know about it ? On what does it depend?

[tonistiigi]

moby/moby#42968