Tibor Vass 5dc7f8fc9b builder: set buildkit's exported product variable via PRODUCT
This introduces a PRODUCT environment variable that is used to set a constant
at dockerversion.ProductName.

That is then used to set BuildKit's ExportedProduct variable in order to show
useful error messages to users when a certain version of the product doesn't
support a BuildKit feature.

Signed-off-by: Tibor Vass <tibor@docker.com>
Upstream-commit: 195919d9d645aa4ab5680a2331c57ff33eb9e5d9
Component: engine
2018-07-16 21:41:54 +00:00
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