feat(pipewire): Add alsa integration

Any programs running through alsa only (such as spotify_player on
voidlinux) should now also work correctly through the pipewire stack.

roles/display_manager/defaults/main.yaml

@@ -0,0 +1,8 @@
+---
+# should the system automatically login as the primary user
+dm_auto_login: true
+
+# default command to run on login
+# can be pause if we use services to start graphical env
+# otherwise a shell, e.g. zsh makes sense
+dm_command: pause