prefere yarnpkg over yarn
prefere yarnpkg over yarn

to avoid conflict with Hadoop Yarn cli.

I don’t know the best practice, but i do
have Apache Yarn installed on my machine, so
I get this conflict. Of course this conflict does
not arised when building within the docker.

https://github.com/yarnpkg/yarn/issues/2337
Signed-off-by: Gaetan Semet <8ccd13098305f7fadd4fdccc2da60bfdfa8d8d20@xeberon.net>

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