docs: document post_install_commands, archive plugins, and mailpit SMTP

README.md

@@ -31,11 +31,31 @@ services:
       # Inline YAML config for automatic plugin/theme installation.
       # Use wordpress_org_plugins, wordpress_archive_plugins, wordpress_custom_plugins, and wordpress_custom_themes.
       WORDPRESS_SETUP_CONFIG_YAML: |
+        # Plugins installed directly from the WordPress.org repository.
         wordpress_org_plugins:
           - advanced-custom-fields
+          - woocommerce
+
+        # Plugins installed from a .zip URL (e.g. GitHub Releases or S3).
+        wordpress_archive_plugins:
+          - slug: my-premium-plugin
+            source: https://example.com/releases/my-premium-plugin-1.0.0.zip
+
+        # Plugins cloned from a Git repository.
+        # Optional: post_install_commands — list of shell commands run after cloning
+        # (and on every container start if the plugin directory already exists).
+        # Commands run from the WordPress root (/var/www/html) with --allow-root.
+        # The env var PLUGIN_DIR is set to the absolute plugin directory path.
         wordpress_custom_plugins:
           - slug: my-plugin
             source: https://github.com/org/my-plugin.git
+          - slug: my-plugin-with-fixup
+            source: https://github.com/org/my-plugin-with-fixup.git
+            post_install_commands:
+              - ln -sfn real-dir "$PLUGIN_DIR/expected-dir"
+              - wp --allow-root option update my_plugin_option value
+
+        # Themes cloned from a Git repository.
         wordpress_custom_themes:
           - slug: my-theme
             source: https://github.com/org/my-theme.git
@@ -62,6 +82,24 @@ docker compose up -d --build
 docker compose exec --user www-data wordpress wp user reset-password <username> --show-password --skip-email
 ```
 
+### Local e-mail (mailpit)
+
+When you add the `mailpit` service to your override, all outgoing WordPress e-mails are captured and visible at <http://localhost:8025>.
+
+To route WordPress mail through mailpit, install the [wp-simple-smtp](https://github.com/LibreCodeCoop/wp-simple-smtp) plugin and add the following `post_install_commands` to its entry:
+
+```yaml
+- slug: wp-simple-smtp
+  source: https://github.com/LibreCodeCoop/wp-simple-smtp.git
+  post_install_commands:
+    - wp --allow-root option update smtp_host mailpit
+    - wp --allow-root option update smtp_port 1025
+    - wp --allow-root option update smtp_auth 0
+    - wp --allow-root option update smtp_secure ''
+```
+
+mailpit's SMTP port inside the Docker network is **1025**; the web UI is exposed on host port **8025**.
+
 ## Checking if have files changed at core
 
 You need to put the `.git` folder of current version of WordPress at root directory of current site and run `git status`