feat: add users/{user}/nixos.nix support

users/matej/keys.nix

@@ -0,0 +1,6 @@
+{
+  sshAuthorizedKeys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICQGLdINKzs+sEy62Pefng0bcedgU396+OryFgeH99/c janezicmatej"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDk00+Km03epQXQs+xEwwH3zcurACzkEH+kDOPBw6RQe openpgp:0xB095D449"
+  ];
+}

users/matej/nixos.nix

@@ -0,0 +1,27 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+let
+  keys = import ./keys.nix;
+in
+{
+  users.users.matej = {
+    uid = 1000;
+    isNormalUser = true;
+    home = "/home/matej";
+    shell = pkgs.zsh;
+    extraGroups = [
+      "wheel"
+      "docker"
+    ];
+    openssh.authorizedKeys.keys = keys.sshAuthorizedKeys;
+  };
+
+  users.groups.matej = {
+    gid = 1000;
+    members = [ "matej" ];
+  };
+}