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style(docker): newer versions of docker require keyword as to be of same case as from

Raphael Defosseuxrequested to merge
style-dockerfile-as-uppercase into develop

As reported by Sagar, newer versions of docker build engine require to have AS keyword in the same case as FROM.

I checked in dockerfile reference: The instruction is not case-sensitive. However, convention is for them to be UPPERCASE to distinguish them from arguments more easily.

But in the example for FROM:

FROM [--platform=<platform>] <image> [AS <name>]

They put an uppercase to AS.

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