Using Red Hat OpenShift Container Platform for building the image
Once you have a Dockerfile and the other artifacts that make up your new S2I builder image, you can put them in a git repository and use Red Hat OpenShift Container Platform to build and push the image. Define a Docker build that points to your repository.
If your Red Hat OpenShift Container Platform instance is hosted on a public IP address, the build can be triggered each time you push into your S2I builder image GitHub repository.
You can also use the ImageChangeTrigger to trigger a rebuild of your applications that are based on the S2I builder image you updated.