Add bin directory to drush PATH

stack/drupal/buildout.hash.cfg

@@ -4,7 +4,7 @@ md5sum = 158282e578bf9416f5e0e524496b9f68
 
 [template-drupal-instance]
 filename = drupal-instance.cfg.in
-md5sum = e78f8c1bf06be85554b1455422722703
+md5sum = 61dada62768497bd6c5899573490c4ee
 
 [template-settings.php]
 filename = default.settings.php.in

stack/drupal/drupal-instance.cfg.in

@@ -49,6 +49,8 @@ recipe = slapos.cookbook:wrapper
 command-line =
   ${php-bin:wrapper-path} ${directory:www}/vendor/drush/drush/drush
 wrapper-path = ${directory:bin}/drush
+environment =
+  PATH=${directory:bin}:$PATH
 
 [composer-bin]
 recipe = slapos.cookbook:wrapper