style(k3s): get config from default instead of hard code

metal/roles/k3s/defaults/main.yml

@@ -2,3 +2,10 @@ k3s_version: v1.22.2+k3s2
 k3s_config_file: /etc/rancher/k3s/config.yaml
 k3s_token_file: /etc/rancher/node/password
 k3s_service_file: /etc/systemd/system/k3s.service
+k3s_server_config:
+  disable:
+  - local-storage
+  - servicelb
+  - traefik
+  disable-cloud-controller: true
+  secrets-encryption: true

metal/roles/k3s/templates/config.yaml.j2

@@ -5,10 +5,5 @@ server: https://{{ hostvars[groups['masters'][0]].ansible_host }}:6443
 {% endif %}
 token-file: {{ k3s_token_file }}
 {% if 'masters' in group_names %}
-disable-cloud-controller: true
-disable:
-- local-storage
-- servicelb
-- traefik
-secrets-encryption: true
+{{ k3s_server_config | to_nice_yaml }}
 {% endif %}