Yep, buildkit does incremental builds quite well We find the dominating factor in (our) incremental builds / CI to be network/io caching, which has less to do

Yep, buildkit does incremental builds quite well We find the dominating factor in (our) incremental builds / CI to be network/io caching, which has less to do with firecracker/docker and more with the surrounding hw/sw (gha topology & smarts, IO speed, ...). It's a real problem in GPU/AI CI where we get monster image sizes. There were some cool blog posts ~last year on caching and routing tricks happening at GH (joint with MSR?), but they've seemingly gone silent..