The car lease demo's "Deploy to Bluemix" button needs updating to leverage the Continuous Delivery service that replaced the DevOps service. You can manually create a Continuous Delivery service for your Bluemix org/account.
Once created, you can select the option to create a new pipeline from a template, and select the Simple Cloud Foundry toolchain template. Specify the Car Lease repository's address in the "Source repository URL:" field - https://github.com/IBM-Blockchain/car-lease-demo.
That should set you up with a pipeline. I should note that the Blockchain services are being refreshed in the near term, and hence even this workaround will be short lived, until the team gets around to updating the Car Lease demo for Hyperledger Fabric v1.0.