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BuildKit doesn't support saving or loading cache mounts, so they can't be persisted across builds in CI providers. However, there is an open issue to allow changing the location of cache mounts so they can be exported and reused across builds.
In practice, this means that you can use BuildKit cache mounts in your generic CI providers like GitHub Actions, CircleCI, etc., by routing your image build to remote Depot builders. Our depot CLI is a drop-in replacement for docker build, so getting faster builds with all of the BuildKit features (like cache mounts) is a one-line code change in your existing CI workflow.