Install yarn in GDK docker image

Closes #221 (closed)

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• 777ed6ad - Add APT https transport package

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• 4e3e1acc - Install newer version of nodejs in docker image

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unmarked as a Work In Progress

It appears that this change works fine. Merging since gitlab-development-kit:latest images is already pushed to the registry. We still need to document that we no longer can use nodejs from official repository on Ubuntu Xenial /cc @jacobvosmaer-gitlab

assigned to @grzesiek

mentioned in commit 5503c20b

merged