Capsul is a NixOS-friendly hosting provider. Currently, the NixOS images which Capsul is able to provision must be updated manually. Here is how Aynish did this... to quote them directly from Matrix:
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okay, here's what i did:


* went to releases.nixos.org and followed the web ui to the most recent release of 23.11 (highest number after nixos-...-23.11.iso)
* i clicked on the sha1 for the iso i wanted (x86_64-linux)
        https://releases.nixos.org/nixos/23.11/nixos-23.11.4248.01885a071465/nixos-minimal-23.11.4248.01885a071465-x86_64-linux.iso.sha256 it has both url and hash
* I went to https://git.cyberia.club/cyberia/capsul-images and cloned it
* I copied nixos/22.11 to nixos/23.11
* cp -R nixos/22.11 nixos/23.11
*     I updatded system.stateVersion in configuration.nix
    and then changed the references to the new one folder in build.yarn
    in nixos/23.11/packer.json i updated references to the new iso

```
nix-shell -p packer
cd nixos
./build 23.11
```
and now I'm waiting a bunch for it to finish. Once it finishes, I'll try and boot it up in qemu and check that it works. Then I'll submit a PR
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That's the current status. Once it's been double checked, this also needs to be documented at: