Fix#141.
With this change, a github action is added that builds a multiarch docker image on every commit, supporting x86_64, aarch64 and arm/v7.
When the action is triggered on a release or tag, it also uploads the versioned image to github container image registry.
Co-authored-by: Jörn Friedrich Dreyer <jfd@butonic.de>
Jairo LlopisandJörn Friedrich Dreyer