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Buildah is preinstalled on GitHub's ubuntu-24.04 runners, so you can build and push container images with plain shell scripts and no external actions. How buildah from/run/copy/commit works, and how to keep layer count and image size minimal, using the opencode-server build scripts as a real example.

UpCloud Kubernetes Service (UKS) provides a managed control plane. But you can also attach individual cloud servers directly, outside the node group mechanism. Here's how it works.