This patch adds some basic build instructions for the container image
build infrastructure.

Since currently setups are failing due to missing hcloud secret, this
will be adjusted by this action.

This patch extends the installation run, by populating the known_hosts
file of SSH before running further commands. This provides a better
hands-off install.

This patch adds a few util functions to deploy the entire kubernetes
cluster using `make deploy`. Currently it's still very iterative and not
ideal, but it works.

This patch adds the first iteration of the terraform definitions
required to deploy a Kubernetes cluster on Hetzner Cloud.

It installs the 3 node infrastructure and still needs quite some work,
but so far, it's a solid start. It's heavily inspired by `hcloud_okd4`,
that much, that is reuses the entire hcloud_instance module from there,
as well as various concepts.

References:
https://github.com/slauger/hcloud-okd4
https://git.shivering-isles.com/github-mirror/slauger/hcloud-okd4