feat(emacs/tramp): add NixOS support for TRAMP connections

docs/emacs/packages/emacs-builtin.org

@@ -460,6 +460,7 @@ supported natively. I will describe them here.
 (use-package tramp
   :straight (tramp :type built-in :build t)
   :config
+  <<tramp-nixos>>
   <<tramp-add-yadm>>
   (setopt tramp-ssh-controlmaster-options nil
           tramp-verbose 0
@@ -469,6 +470,19 @@ supported natively. I will describe them here.
                (cons tramp-file-name-regexp nil)))
 #+end_src
 
+*** SSHing into NixOS remotes
+When using TRAMP to SSH into remote NixOS hosts, the true =$PATH= gets
+truncated, rendering some binaries unavailable, such as =git= or =nil= (an
+LSP server for the Nix language). To fix that, we simply need to write
+the following code.
+#+name: tramp-nixos
+#+begin_src emacs-lisp :tangle no
+(require 'tramp-sh)
+(setq tramp-remote-path (append tramp-remote-path
+                                '(tramp-own-remote-path)))
+
+#+end_src
+
 *** Yadm
 [[https://yadm.io/][~yadm~]] is a git wrapper made to easily manage your dotfiles. It has
 loads of features I don’t use (the main one I like but don’t use is