Check for preview in Workday Studio

Today I learned how to check if a Workday studio is running in the preview environment.

Saving this here since I don't know if I'd ever remember context.customerId even a few days from now.

props["tenant"] = context.customerId;

// true/false if the tenant is preview
props["inPreview"] = (props["tenant"].toString().indexOf("preview") > 0) ? true : false;