WIP: move nixos modules

modules/nixos/nix-serve.nix

@@ -0,0 +1,43 @@
+{ config, lib, ... }:
+
+let
+  user_keys = user:
+    lib.optionals (builtins.hasAttr "bertof" config.users.users)
+      config.users.users.${user}.openssh.authorizedKeys.keys;
+in
+{
+  # nix.buildMachines 
+  nix.distributedBuilds = true;
+
+  nix.sshServe = {
+    enable = true;
+    keys = user_keys "bertof";
+    write = true;
+    protocol = "ssh-ng";
+  };
+
+  services.nix-serve = {
+    enable = true;
+    openFirewall = true;
+    secretKeyFile = "/etc/nix/serve";
+  };
+
+  nix.settings = {
+    trusted-users = [ "root" "nix-ssh" "@wheel" ];
+    trusted-public-keys = [
+      "odin:ukZZy//P0nBAcy4ycX8eYCByRJFOfJRlfW4sYjP/rGE="
+      "loki:jVAH1bQugXdQ1w29lvVknyPqWwmAn7WhjKf7z4t+q7E="
+    ];
+    substituters = [
+      # "https://192.168.0.10"
+      # "https://192.168.0.100"
+      # "ssh-ng://loki.local"
+      # "ssh-ng://odin.local"
+      # "ssh-ng://192.168.0.10"
+      # "ssh-ng://192.168.0.100"
+    ];
+    # trusted-substituters = [
+    # ];
+  };
+
+}