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- Fixes #736. - BuildKit returns nil ref for Dockerfiles containing only metadata (`ENV/ARG/LABEL`) directives without filesystem operations (`RUN/COPY/ADD`). Previously, this caused builds to fail with "no build directives" error. - Builder-shim 0.6.3 [fixes this](https://github.com/apple/container-builder-shim/pull/47) by creating a minimal marker layer when ref is nil but image config is valid, satisfying OCI manifest requirements. - Also, added some tests for this behavior.