Comment by battery_cowboy

They added the ability to take build artifacts now which is great. I haven't used it yet, but I plan to use it for my static gen site eventually.

I'd love to be able to use my own image, though, I feel bad everytime my build script has to use 3 minutes of build server slot time to download and install a bunch of packages before it actually builds my project, if I could make a custom docker image to build in, or there was caching, it would use less time.