Fork this repository and use as a "Config Repository" in GoCD.
See a tutorial here for creating a K3S cluster with GoCD installed, as well as a full docker deployment pipeline for a backend application.
https://github.com/V-Sekai/groups-gocd-pipelines/wiki/Home
I'd be happy to answer any questions you have about this pipeline: E-mail me (see git log for email addresses) or ping me on discord Lyuma#0781 or in the Godot irc or discord, or file issues and PR's here.