ci: UPSTREAM_COMMIT was never declared as a variable in bake

[dvdksn]

Signed-off-by: David Karlsson [email protected]

Description

The validate-upstream workflow uses UPSTREAM_COMMIT to define which Git commit to use for a temporary vendor of upstream doc files.

https://github.com/docker/docs/blob/main/Dockerfile#L64-L65

But due to a typo in the Bake file, UPSTREAM_MODULE_NAME is defined as a variable twice, and `UPSTREAM_COM is never defined as a variable:

https://github.com/docker/docs/blob/main/docker-bake.hcl#L152-L160

I don't know how validate-upstream has successfully ran before. We don't set the commit version as a build-arg, we use ENV. I thought that meant we need to declare a null variable in the bake file. Maybe it works anyway. But this is "more correct" anyway.

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