Gitpod in a Docker container with k3s

This is merely a starting point

Things that are working:

• latest installer is integrated
• PVCs are provisioned using local-path
• All containers go out of pending (some don't work because of the buildin-registry-certs issue)

Things that are missing:

• generating self-signed certs in the entrypoint.sh
• all the DNS setup, e.g. patching CoreDNS in the entrypoint

Things that are not working:

• the builtin-registry-certs secret seems to be missing