feat(darwin): new host - frieren

hosts/darwin-fern/default.nix

@@ -1,7 +1,7 @@
 _:
 #############################################################
 #
-#  Fern - MacBook Pro 2022 13-inch M2 16G, mainly for business.
+#  Fern - MacBook Pro 2022 13-inch M2 16G.
 #
 #############################################################
 let

hosts/darwin-frieren/default.nix

@@ -0,0 +1,13 @@
+_:
+#############################################################
+#
+#  Fern - MacBook Pro 2024 14-inch M4 Pro 48G, mainly for business.
+#
+#############################################################
+let
+  hostname = "frieren";
+in {
+  networking.hostName = hostname;
+  networking.computerName = hostname;
+  system.defaults.smb.NetBIOSName = hostname;
+}

hosts/darwin-frieren/home.nix

@@ -0,0 +1,14 @@
+{
+  programs.ssh = {
+    enable = true;
+    extraConfig = ''
+      Host github.com
+        Hostname github.com
+        # github is controlled by frieren~
+        IdentityFile ~/.ssh/frieren
+        # Specifies that ssh should only use the identity file explicitly configured above
+        # required to prevent sending default identity files first.
+        IdentitiesOnly yes
+    '';
+  };
+}