[DevOps] ipxe-examples fix issues

[irishgordo]

What's the test to develop? Please describe

We need to fix a series of issues with the ipxe-examples

Describe the items of the test development (DoD, definition of done) you'd like

• introduce ntp server, to better assist with sync
• remove isc dhcp deprecation, introduce Kea which has builtin DNS
• create docker daemon.json to resolve docker registry consistently when multiple interfaces exist on vm
• set up resolv conf nameserver for K3s on Rancher VM
• tell Harvester to use DNS server that exists within Kea
• update airgap readme
• switch to helm install not helm template for airgap
• shift registry to a different vm
• create fstab w/ blkid for vm that provides registry, to automount drives if node needs to get shutdown/reboot
• automatiaclly set container-d registry when nodes boot for the first time
• minio
• caddy flile store
• proactively grab files / images / etc

Additional context

[irishgordo]

Pivoted back to isc-dhcp-server, as isc-kea-dhcp4-server's configuration is a bit more difficult to figure out

[irishgordo]

Opened harvester/harvester#4618 ,as when that's figured out a pivot can be made away from isc-dhcp-server, content provided in 4618 highlights some elements from this