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I'm trying to build a container image using `pulumi_docker.Image`, passing `"DOCKER_BUILDKIT": "1"` in the `pulumi_docker.DockerBuild` `env` argument, as documented (<https://www.pulumi.com/docs/reference/pkg/docker/image/#dockerbuild>) to enable BuildKit support, but my image builds are failing with errors like
```    error: the --mount option requires BuildKit. Refer to <https://docs.docker.com/go/buildkit/> to learn how to build images with BuildKit enabled```
which suggests that BuildKit somehow isn't being used. Has anyone else been successful with a BuildKit-enabled image build?