For those that want to DIY beyond the scope of this repo, you can use the systemd units in the Butane template as an example of how to run Forem without Fedora CoreOS on a Linux distribution that supports systemd, or customize that template to fit your needs or create a bootable Ignition configuration to consume on bare metal or in a custom VM.
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Hey @nasheayahu this sounds exciting! Welcome to the community 👋
From what I understand our Systems team wrote in the Readme for the Self-Host Repo, it looks like you can indeed use both Rocky Linux and openSUSE (but not openSUSE Leap, as there is no systemd package available for it: