Use drush instead of vendor/bin/drush
This isn't really a Drupal or Drush question, but a Bash/shell question: How to run a script in the current directory?


The script must be executable: chmod u+x drush
The script must be in the (executable) path. Since it's not recommended to have the current directory in the path (for very good security reasons), the solutions is to call Drush as ./drush instead of just drush.