@trick14 it is available, and works in most projects.
If it does not work in your project please create a #issues:build-issues report (with the build url), and in the meantime while we’re working on fixing it for your project too, either use the linked workaround (Xcode 9 GM - Failed to create target code sign properties mapping, error) or send us a pull request to the step with a fix (all steps are open source).