Use openshift/origin-base as an image base

[paulfantom]

This uses alpine as a base image to get started with CI pipeline

/wip

[derekwaynecarr]

please use the following FROM openshift/origin-base.

see cluster monitoring operator as an example:
https://github.com/openshift/cluster-monitoring-operator/blob/master/Dockerfile#L1

[paulfantom]

@derekwaynecarr thanks for chiming in 👍

This is a temporary solution for testing purposes only and it basically reverts kubernetes-sigs/cluster-api#213. Right now we need any image which can be used in CI to build images and later we can dive into details.

There was a discussion in slack channel #forum-testinfra about various base images, how exactly FROM is working in ci-operator/prow, and if it is possible to use something different than openshift/origin-v3.11 (example) image. It was inconclusive hence this PR.

In the end if we want to maintain our implementation of cluster-api-provider-aws, then we can use openshift/origin-base, but if we want to use upstream images, it might be good to have similar build process to upstream one.

[ingvagabund]

Would be great to run it through the CI first. Otherwise, I don't see anything wrong about it right now.

[paulfantom]

/test all

[smarterclayton]

/refresh

[paulfantom]

/retest

[paulfantom]

/assign @ingvagabund @enxebre

[ingvagabund]

/lgtm

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[frobware]

/lgtm