[suchar]

For DigitalOcean (and several other providers) you can build your own image with provided configurations, e.g.: https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/v...

(see `virtualisation` folder for other providers)

Then you can do something like:

    nix build .#nixosConfigurations.doImage.system.build.digitalOceanImage

And in the `result` directory you will have droplet image which can be uploaded to digital ocean as droplet template.

Its probably best to also create separate configuration only for the image. As a bonus, its already configured, so no need to run `nixos-rebuild switch` after droplet creation. Partitioning configuration is also handled by the builded, however, filesystem choice (and partitioning schema) is limited

(I'm not saying that this is easier than out of the box support for NixOS: IMO if you are even aware how to create custom NixOS image then you are probably somewhat experienced NixOS user)