Added:
- Migrate from rkt to Docker for running Kubelet on Flatcar Linux (#801)
- Run Kubelet using
quay.io/poseidon/kubelet
image instead of the Hyperkube image on Flatcar Linux for Kubernetes 1.18 and newer. The image/repository can be customized using the-node-kubelet-repository
flag. Hyperkube is still used for Kubernetes < 1.18 (#801)