feat: convert template-base into k8s-ready VM template

nixos/template-base/README.md

@@ -1,17 +1,16 @@
-# NixOS Proxmox Template Base
+# NixOS Proxmox k8s-base Template
 
-This folder contains a minimal NixOS base config you can copy into a new
+This folder contains a Kubernetes-ready NixOS base config for your Proxmox
 template VM build.
 
 ## Files
 
-- `flake.nix`: pins `nixos-24.11` and exposes one host config.
-- `configuration.nix`: base settings for Proxmox guest use.
+- `flake.nix`: pins `nixos-25.05` and exposes one host config.
+- `configuration.nix`: k8s-base settings for Proxmox guests.
 
 ## Before first apply
 
-1. Replace `REPLACE_WITH_YOUR_SSH_PUBLIC_KEY` in `configuration.nix`.
-2. Add `hardware-configuration.nix` from the VM install:
+1. Add `hardware-configuration.nix` from the VM install:
    - `nixos-generate-config --root /`
    - copy `/etc/nixos/hardware-configuration.nix` next to `configuration.nix`
 
@@ -23,5 +22,6 @@ sudo nixos-rebuild switch --flake .#template
 
 ## Notes
 
-- This is intentionally minimal and avoids cloud-init assumptions.
-- If you want host-specific settings, create additional modules and import them.
+- This pre-installs heavy shared Kubernetes dependencies (containerd + kube tools)
+  to reduce per-node bootstrap time.
+- Cloud-init still injects the runtime SSH key and per-node hostname/IP.