Automate docker image publishing (latest is 4 years old !)

[yogeek]

I wanted to test the tool by using the docer image pointed in the documentation but it failed (cf. #178 )

And the I found out that the docker image has not been updated for 4 years apparently... hub.docker.com/r/gofed/cluster-capacity

It would be nice to automate the docker image build and its publishment to a registry in the CI

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/lifecycle stale

[ingvagabund]

Following https://github.com/kubernetes/k8s.io/tree/main/registry.k8s.io