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 <gaetan@xeberon.net>
[Yarn](https://yarnpkg.com/) is a drop in replacement for npm.
We should use it because:
* It's faster
* It uses a lockfile, making the builds more deterministic.
