Saw that you didn’t have 2.0 beta access; we’re actually opening that up to everyone this week, so keep an eye on our docs over the next few days. Biggest features you probably care about are the faster speeds/improved caching and native Docker support.

In a GCCB build, we volume-mount in the VM host's docker daemon socket, so you can use the docker CLI, and related CLIs, with no additional setup.

We initially tried a docker-in-docker approach here, but it was a bit too fragile. This attempt was quite some time ago, so it's possible things have improved.