feat: add new host and start modularizing system configuration

users/breakglass/default.nix

@@ -0,0 +1,17 @@
+{ pkgs, lib, ... }:
+{
+  users.users.breakglass = {
+    home =
+      if pkgs.stdenv.isLinux then
+        lib.mkDefault "/home/breakglass"
+      else if pkgs.stdenv.isDarwin then
+        lib.mkDefault "/Users/breakglass"
+      else
+        abort "Unsupported OS";
+  } // lib.optionalAttrs pkgs.stdenv.isLinux {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    # NOTE: Generated with `mkpasswd`
+    hashedPassword = "$y$j9T$U7phasQYqMhxY8WXoiHL51$IHHDTreR4uZrvAC1Xusjy2M0yXkU.vLy3z6zBjZCFX.";
+  };
+}