Add logic to parse BUILDKIT_SYNTAX option for --build-arg #3148
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Passing a build description using a custom frontend to a BuildKit instance with dockerfile.v0 frontend disabled does not lead to a successful build, even though using a custom dockerfile syntax should use the gateway.v0 frontend in the BuildKit instance.
Though the change I added fixes the bug described in #3077, I discovered a similar bug while using a BuildKit instance with dockervile.v0 disabled. If you use the #syntax directive in the custom dockerfile without the BUIDKIT_SYNTAX option, the build will fail with the same error as described in the aforementioned issue.
If any maintainer wants me to work on this newly discovered bug I would be happy to do so.
Anyway, this is my first pull request so advice and feedback are greatly appreciated, thank you!