This sample dotfiles repo contains a installation script (install.sh) that copies .default.gitpod.yml and .default.gitpod.Dockerfile from this repo to your newly opened workspace, it will not replace an existing .gitpod.yml. Feel free to fork this repo and add modify the files to your preference.
You can also merge this install.sh with your own dotfiles repo. For more information about gitpod dotfiles please check https://www.gitpod.io/docs/config-dotfiles