[fugitive] Add config for an impermanent system

lib/users/christian/default.nix

@@ -0,0 +1,10 @@
+{pkgs, ...}: {
+
+  config = {
+    users.users.christian = {
+      packages = with pkgs; [ vim git ];
+      openssh.authorizedKeys.keyFiles = [ ./pubkey ];
+    };
+  };
+  
+}