Add support for setting the default sound card on FreeBSD.

ansible/roles/base/tasks/freebsd.yaml

@@ -146,3 +146,14 @@
     group: wheel
   loop:
     - disk_labels
+
+- name: Configure sysctls
+  when: sound_default_unit is defined
+  sysctl:
+    name: "{{ item.name }}"
+    value: "{{ item.value }}"
+    state: present
+    sysctl_file: "/etc/sysctl.conf.local"
+  loop:
+    - name: hw.snd.default_unit
+      value: "{{ sound_default_unit }}"