centroid: get pipewire sound working

machine/centroid/default.nix

@@ -18,7 +18,24 @@
   };
 
   networking.networkmanager.enable = true;
-  users.users.tvb.extraGroups = [ "networkmanager" ];
+
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # To avoid needing an active user session, run a single system instance
+    systemWide = true;
+  };
+
+  environment.systemPackages = with pkgs; [
+    mpv  # cli media player
+  ];
+
+  users.users.tvb.extraGroups = [
+    "networkmanager"
+    "pipewire"
+  ];
 
   system.stateVersion = "23.11";
 }