feature(steam): add proton-ge compatibility layer to steam

Reviewed-on: #4

modules/nixos/steam.nix

@@ -10,6 +10,10 @@
     remotePlay.openFirewall = true;
     dedicatedServer.openFirewall = true;
     localNetworkGameTransfers.openFirewall = true;
+    # add proton-glorious-eggroll
+    extraCompatPackages = with pkgs; [
+      proton-ge-bin
+    ];
   };
 
   # fix black screen in steam when using xwayland-satellite