Document that token is (mostly) optional now

The token is still required when using Vagrant.

Signed-off-by: Marko Vukovic <8951449+anon-software@users.noreply.github.com>

Vagrantfile

@@ -28,6 +28,7 @@ def provision(vm, role, node_num)
     ansible.extra_vars = {
       k3s_version: "v1.28.14+k3s1",
       api_endpoint: "#{NETWORK_PREFIX}.100",
+      # Required for vagrant ansible provisioner
       token: "myvagrant",
       # Required to use the private network configured above
       extra_server_args: "--node-external-ip #{node_ip} --flannel-iface eth1", 

inventory-sample.yml

@@ -19,6 +19,7 @@ k3s_cluster:
     # - openssl rand -base64 64
     # - pwgen -s 64 1
     # You can use ansible-vault to encrypt this value / keep it secret.
+    # Or you can omit it if not using Vagrant and let the first server automatically generate one.
     token: "changeme!"
     api_endpoint: "{{ hostvars[groups['server'][0]]['ansible_host'] | default(groups['server'][0]) }}"
     extra_server_args: ""