auto trigger Xdebug3 on request in dev env

Author: n-peugnet

.env.dev

@@ -3,4 +3,6 @@ APP_SECRET=db451bc84dc761db739dbafc78798b9e
 # Default dev database uses sqlite so there is no need for a database daemon.
 DATABASE_URL=sqlite3:///%kernel.project_dir%/var/data.db
 # Dummy default so that checks work whitout any config
-MAILER_DSN=smtp://localhost
+MAILER_DSN=smtp://localhost
+# Automatically trigger Xdebug3 on requests
+XDEBUG_TRIGGER=1