feat: official docker images

I recently found this project, and one of the first things I did was fork a community-run, somewhat outdated, repo to build images and update the workflow so that e.g. it builds for amd and arm, releases on the GitHub registry, etc.

https://github.com/maybeanerd/xmage

Now that "normal" releases are back, one could consider moving this process into this repository and publish official images.

Is there interest for this? If so, I could prepare a PR

Review the linked maybeanerd/xmage repository and its image-building workflow, then inspect this repository's release process to determine what would need to be integrated. The issue needs an agreed scope before implementation; done would mean maintainers have accepted a process for publishing official multi-architecture images to the GitHub registry.

Written by the indexing model from the issue text.