How to containerize a GUI app on top of ubi8 base images

I would love to figure out how to do this for the reasons described in this article:

https://medium.com/@SaravSun/running-gui-applications-inside-docker-containers-83d65c0db110

To summarize, using RHEL8, I would like to create container images containing ready to go development environments, including GUI apps (e.g. Visual Studio Code) and then figure out how to remote the GUI to the container host. But I cannot figure out what and how to install necessary prereqs onto the image with buildah.