Add pre-built packages for multiple architectures

[jukie]

Coming from https://github.com/piraeusdatastore/piraeus/issues/74#issuecomment-829276198

Would you be able to support more than just amd64 or is that a conscious decision (understandably) to push people to the paid product?

[rck]

the piraeus-client is pulled in from a package https://github.com/piraeusdatastore/piraeus/blob/master/dockerfiles/piraeus-client/Dockerfile

So if we decide to open up piraeus for other architectures we would put these components into the public repos. No changes required here. So let's keep the discussion to the piraeus issue. I'm closing this one here