arm / arm64 capable images

[faust64]

Is your feature request related to a problem? Please describe.

I'm trying to deploy the docker-registry-exporter on some arm64 based Kubernetes cluster.
Ends up in some exec format error.

Describe the solution you'd like

It would be nice for the next docker images to be built with multi-arch support. Considering we're just packaging some python files, I doubt your image is very much different from the one I built on my cluster, using your sources.

Describe alternatives you've considered

Building my image and pushing it to my registry does work, though I can not redeploy my registry with that exporter, if Kubernetes has to pull that image out of a registry that is currently offline and being redeployed.

[faust64]

FYI: forked here https://gitlab.com/synacksynack/opsperator/docker-registryexporter
Pushing amd64+arm64 images to registry.gitlab.com/synacksynack/opsperator/docker-registryexporter:master