nix package / flake

[Arbel-arad]

I am interested in using acme2certifier with XCA on my nixOS based servers, which would require a nix package.

from a quick glance at the build script looks like it should be relatively easy to package.
Would you prefer adding the flake components to this repo or should i create an external one for the package?

[grindsa]

Hi,

i am happy to accept a PR. So no need to create an external repo.

/G.