Add a missing command to build Sass files

Author: javiereguiluz

composer.json

@@ -93,7 +93,8 @@
         "auto-scripts": {
             "cache:clear": "symfony-cmd",
             "assets:install %PUBLIC_DIR%": "symfony-cmd",
-            "importmap:install": "symfony-cmd"
+            "importmap:install": "symfony-cmd",
+            "sass:build": "symfony-cmd"
         },
         "post-install-cmd": [
             "@auto-scripts"