Move to docker for smaller footprint

[Kimi450]

Running kubernetes itself takes around 450-500m CPU cycles (half a core) just for the supporting pods, not counting for system components like kubelet. For a home setup, this is a non-trivial amount.

Unlikely that a home setup will also have several machines running in a cluster (to make k8s actually worthwhile)

[Kimi450]

Too much effort tbh for just ~0.5-0.7 cores. If I find the time and motiviation I might come back to this.