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build: use builtin frontend for BUILDKIT_SYNTAX=dockerfile.v0#3751

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crazy-max:builtin-buildkit-syntax
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build: use builtin frontend for BUILDKIT_SYNTAX=dockerfile.v0#3751
crazy-max wants to merge 1 commit intodocker:masterfrom
crazy-max:builtin-buildkit-syntax

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follow-up moby/buildkit#6594

Buildx currently rewrites any BUILDKIT_SYNTAX value to gateway.v0 and passes the syntax image through source and cmdline.

This change keeps BUILDKIT_SYNTAX=dockerfile.v0 on the builtin Dockerfile frontend and only uses gateway.v0 for non-builtin syntax values. This is to preserve the expected frontend identity on the Buildx side so the BuildKit changes in moby/buildkit#6594 can work as intended.

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
@crazy-max crazy-max requested a review from tonistiigi March 27, 2026 14:25
@crazy-max crazy-max marked this pull request as ready for review March 27, 2026 14:25
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