support wireless regulatory domain

https://wiki.archlinux.org/title/Network_configuration/Wireless#Respecting_the_regulatory_domain

group_vars/all

@@ -337,3 +337,5 @@ hardened:
 kernel_parameters: "quiet consoleblank=60"
 
 power_management: "tlp"
+
+regdomain: "US"

playbook.yml

@@ -23,6 +23,7 @@
     - { role: pass, tags: ['pass'] }
     - { role: iptables, tags: ['iptables'] }
     - { role: nettools, tags: ['nettools'] }
+    - { role: regdomain, tags: ['regdomain'], when: "regdomain is defined" }
     - { role: openvpn, tags: ['openvpn'] }
     - { role: nmtrust, tags: ['nmtrust'] }
     - { role: unbound, tags: ['unbound'] }

roles/regdomain/tasks/main.yml

@@ -0,0 +1,12 @@
+---
+- name: Install wireless-regdb
+  pacman:
+    name: wireless-regdb
+    state: present
+
+- name: Set wireless regulatory domain
+  lineinfile:
+    dest: /etc/conf.d/wireless-regdom
+    regexp: ^WIRELESS_REGDOM
+    state: present
+    line: 'WIRELESS_REGDOM="{{ regdomain }}"'