The gophers are https://podman.io/ which builds and runs containers. My guess is they are building the same application in multiple distros for their one application

Like

my-app-nix my-app-fedora my-app-alpine

It’s a common practice so users can choose the distro they prefer when launching your container in their stack.

You can use kubernetes on any OCI container deployment.

So if you don’t want/need to install the docker program, you can go with containerd.