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DataHub

Hi, I just wanted to understand the docker build process a bit better. In particular, I noticed in a few Dockerfiles, a reference is made to an environment variable `BUILDPLATFORM`. For instance, here in the `datahub-gms` Dockerfile: <https://github.com/datahub-project/datahub/blob/master/docker/datahub-gms/Dockerfile#L27>
I am not sure where `BUILDPLATFORM` is being set initially, can anyone point me to the place where it is being set?

`BUILDPLATFORM` is part of a set of <https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope|automatically defined (global scope) build arguments> that you can use. It will always match the platform or your current system and the builder will fill in the correct value for us.