Yeah, this is closer to what I do, too. I was surprised not to see a Containerfile in the linked github repo in the article (https://github.com/lthms/tinkerbell)
I found working with normal `dnf` and normal config files much easier than dealing with Ignition and Butane. Plus, working with your image in CI/CD instead of locally fixed my ZFS instability. When Fedora kernel updates, but ZFS doesn't support that version yet, now it fails in GitHub Actions and the container is never built, so there's no botched update that my NAS mistakenly picks up.
I found working with normal `dnf` and normal config files much easier than dealing with Ignition and Butane. Plus, working with your image in CI/CD instead of locally fixed my ZFS instability. When Fedora kernel updates, but ZFS doesn't support that version yet, now it fails in GitHub Actions and the container is never built, so there's no botched update that my NAS mistakenly picks up.