Offload dockermachines into core

[pvizeli]

Breaking change

Proposed change

We made good experience to use the core docker on core repository and make it easier to have changes without affect point release. It's now time to offload the latest part of this process into core for have the same experience and handling.

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[pvizeli]

I don't affect tests

[MartinHjelmare]

I don't understand the description. What experience and handling are we comparing with? Can we link to that?

[pvizeli]

It's only that we pull data from a different repository which don't merge with the dockerfile/build.json on the branch and end up in a disaster. Now all is the same branch and can be updated together.