feat(last-working-dir): log separate lwds for different SSH keys on the same user account (#9534)

Co-authored-by: Marc Cornellà <hello@mcornella.com>

plugins/last-working-dir/README.md

@@ -1,15 +1,33 @@
 # last-working-dir plugin
 
 Keeps track of the last used working directory and automatically jumps into it
-for new shells, unless:
+for new shells, unless the starting directory is not `$HOME`.
 
-- The plugin is already loaded.
-- The current `$PWD` is not `$HOME`.
-
-Also adds `lwd` function to jump to the last working directory.
+Also adds a `lwd` function to jump to the last working directory.
 
 To use it, add `last-working-dir` to the plugins array in your zshrc file:
 
 ```zsh
 plugins=(... last-working-dir)
 ```
+
+## Features
+
+### Use separate last-working-dir files with different SSH keys
+
+If the same user account is used by multiple users connecting via different SSH keys, you can
+configure SSH to map them to different `SSH_USER`s and the plugin will use separate lwd files
+for each one.
+
+Make sure that your SSH server allows environment variables. You can enable this feature
+within the `/etc/sshd/sshd_config` file:
+
+```
+PermitUserEnvironment yes
+```
+
+Then, add `environment="SSH_USER=<SSH_USERNAME>"` before the SSH keys in your `authorized_keys` file:
+
+```
+environment="SSH_USER=a.test@example.com" ssh-ed25519 AAAAC3Nz...
+```