Add with_sqlite() to testing bootstrap and enable SQLite in phpunit.xml

Co-authored-by: srtfisher <346399+srtfisher@users.noreply.github.com>

Author: Copilot

phpunit.xml

@@ -18,7 +18,7 @@
   <php>
     <ini name="error_reporting" value="-1" />
     <ini name="display_errors" value="1" />
-    <!-- <env name="MANTLE_USE_SQLITE" value="true" /> -->
+    <env name="MANTLE_USE_SQLITE" value="true" />
     <!-- <env name="WP_SKIP_DB_CREATE" value="true" /> -->
   </php>
 </phpunit>

tests/bootstrap.php

@@ -8,4 +8,5 @@
  */
 \Mantle\Testing\manager()
 	->maybe_rsync_plugin()
+	->with_sqlite()
 	->install();