drupal: build next.js after drupal is correctly installed

software/drupal/buildout.hash.cfg

 [template-drupal-instance]
 filename = drupal-instance.cfg.in
-md5sum = 5b1c36160fdf459019785ef2d002a278
+md5sum = 3df0d11d328701ae3e45387efa72a4de
 
 [template-settings.php]
 filename = default.settings.php.in

software/drupal/drupal-instance.cfg.in

@@ -86,10 +86,13 @@ command = if [ -z "$(ls -A ${directory:node})" ]; then
     rm -rf ${directory:node};
     cp -ax {{ nextjs_app_location }}/ ${directory:node};
   fi
+  if [ -s "${directory:var}/.install-done" ]; then
+#   build next.js require next and next_jsonapi installed
     export NEXT_PUBLIC_DRUPAL_BASE_URL=${request-frontend:connection-secure_access}
     export NEXT_IMAGE_DOMAIN=${request-frontend:connection-domain}
     cd ${directory:node}
     {{ nodejs_location }}/bin/npm run build
+  fi
 update-command = ${:command}
 stop-on-error = true