WIP: Build image on mantle image

[ashcrow]

Instead of using a submodule we split out the mantle specific code (kola, ore, etc..) into it's own container image which cosa then layers on.

Requires:

• Dockerfile: Simple Dockerfile mantle#1133
• The above built and published

TODO

• Update FROM in Dockerfile

[jlebon]

I think a multi-stage build would be cool for this. The base Fedora image cosa uses I think should belong here instead of indirectly via the mantle Dockerfile.

Really all we want are the final Go binaries, so we could just copy them in. Not sure if Quay supports multi-stage builds, though OpenShift does, and we have a coreos namespace there where we could build this.

[ashcrow]

Good points @jlebon. Looking at the card for this it's a bit confusing as to if this is really meant to be layered or if the cosa container should use the mantle container. In any case, the mantle one has to merge first. Thanks for the early review!!

[cgwalters]

I think this one is obsolete now with the merge.

[openshift-ci-robot]

@ashcrow: PR needs rebase.

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