Adds a check for index.php in the web/ directory.

If a `web/index.php` file does not exist, it will be created automatically during composer install. Resolves an issue that occurs when that file is missing and the site fails to load. 

For more information, see https://docs.pantheon.io/release-notes/2025/02/wordpress-composer-managed-1-32-4

Author: jazzsequence

CHANGELOG.md

@@ -1,3 +1,6 @@
+### v1.32.4
+* Adds a check for `web/index.php` and re-creates the file if it does not exist. Resolves issues where `web/index.php` is missing and breaks a site. ([#173](https://github.com/pantheon-systems/wordpress-composer-managed/pull/173))
+
 ### v1.32.3 (2024-09-10)
 * Updates `COOKIEPATH` and `SITECOOKIEPATH` values to `/` in `application.pantheon.php` to resolve cookie-related nonce authentication failures. Previously, the values were set to `''` (empty string), which does not allow the cookies to allow authentication within all the paths in a domain. ([#164](https://github.com/pantheon-systems/wordpress-composer-managed/pull/164))