Improve Rails invocation in tests (#493)

Author: mgruner

.github/tests/default.sh

@@ -14,11 +14,11 @@ then
 fi
 
 print_heading "Check if elasticsearch index is present…"
-railsserver_run_command rails r "SearchIndexBackend.index_exists?('Ticket') || exit(1)"
+railsserver_run_command bundle exec rails r "SearchIndexBackend.index_exists?('Ticket') || exit(1)"
 print_heading "Elasticsearch index is present :)"
 
 print_heading "Check that translations are present…"
-railsserver_run_command rails r "Translation.any? || exit(1)"
+railsserver_run_command bundle exec rails r "Translation.any? || exit(1)"
 print_heading "Translations are present :)"
 
 print_heading "Execute autowizard…"