CI: Prune Kolla container images after build job finishes #74
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The GitHub Actions runner can easily fill its disk after a few image
builds. Prune the images at the end of the run. The downside is that we
won't benefit from Docker caching. OTOH, it's non-trivial to prune
images in a way that frees up sufficient space and keeps some images
around.
Prune all Kolla images after each container image build job.