> Buildkit can be very efficient at caching, but you need to design your image build around it.

Well, that's what I've been trying to do. And failing, because it simply doesn't work.

> I'd also avoid loading the result back into the docker daemon unless you really need it there.

I need Docker to provide me a reproducible environment to run lints, inspections, UI tests and so on. These images are quite massive. And because caching in Docker is broken, they were getting rebuilt every time we did a push.

Well. I switched to Podman and podman-compose. Now they do get cached, and the build time is within ~1 min with the help of the GHA cache.

And yes, my deployment builds are produced without any caching.