Support for custom kernel #2
Description
Newer versions of Envoy and Cilium are failing because Raspberry Pi OS uses a different page table size from what the tools expect: raspberrypi/linux#4375
Fixing this requires building a custom kernel to use 48-bit page table addresses and adding it to the node. Building the kernel would be a lengthy process, and there's already quite a bit of duplication of logic (most of the build steps aren't specific to nodes and node-specific images are largely unnecessary), so it might be worth looking at breaking things like kernel builds and apt upgrades into an Ansible playbook separate from the golden image.