Set up pipewire for sound.

nodes/hosts/common/configuration.nix

@@ -9,6 +9,7 @@
     ./scripts/upgrade-diff.nix
     ./services/desktopmanager.nix
     ./services/displaymanager.nix
+    ./services/sound.nix
   ];
 
   nixpkgs = {

nodes/hosts/common/services/sound.nix

@@ -0,0 +1,16 @@
+{ ... }: {
+  # Enable sound with pipewire.
+  services.pulseaudio.enable = false;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # If you want to use JACK applications, uncomment this
+    jack.enable = true;
+
+    # use the example session manager (no others are packaged yet so this is enabled by default,
+    # no need to redefine it in your config for now)
+    #media-session.enable = true;
+  };
+}