Pushing an image to the CDK3 Docker registry is not possible. When the image is tagged, the registry port is not used thus Docker will try to contact the CDK Docker registry in port 80 causing a timeout to occur at the UI level.

Steps to reproduce:

1. Create a Docker and OpenShift connection to CDK3 (using the server adapter or manually)
2. Edit the OpenShift connection and add http://172.30.1.1:5000 as the registry address ("minishift docker-env" should tell you about this url)
3. Build your own Docker image on the CDK3 Docker connection
4. Deploy that image and select Push to registry: a timeout will occur after 30s