feat(systemModules:host): add initial host configuration module

used to define general host configuration, including:

- hardware
- name
- admin
- type
- role

system/modules/host/admin/default.nix

@@ -0,0 +1,49 @@
+{ lib, config, pkgs, ... }:
+
+let
+  cfg = config.systemModules.host.admin;
+  ifTheyExist = groups: builtins.filter (group: builtins.hasAttr group config.users.groups) groups;
+  inherit (lib) types mkOption;
+in
+
+{
+  options.systemModules.host.admin = {
+    name = mkOption {
+      type = types.str;
+      default = "ooks";
+      description = "Name of the primary user";
+    };
+    shell = mkOption {
+      type = types.enum ["fish" "bash" "zsh"];
+      default = "zsh";
+      description = "The login shell of the primary user";
+    };
+    sshKey = mkOption {
+      type = types.str;
+      default = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBn3ff3HaZHIyH4K13k8Mwqu/o7jIABJ8rANK+r2PfJk";
+      description = "The ssh key for the admin user";
+    };
+  };
+
+  config = {
+    users.users.${cfg.name} = {
+      isNormalUser = true;
+      shell = pkgs.${cfg.shell};
+      initialPassword = "password";
+      openssh.authorizedKeys = "${cfg.sshKey}";
+      extraGroups = [
+        "wheel"
+        "video"
+        "audio"
+        ] ++ ifTheyExist [
+        "git"
+        "media"
+        "network"
+        "libvirtd"
+        "deluge"
+        "streamer"
+        "torrenter"
+      ];
+    };
+  };
+}