install steam

configuration.nix

@@ -161,6 +161,14 @@
     fish.enable = true;
   };
 
+  programs = {
+    steam = {
+      enable = true;
+      remotePlay.openFirewall = true;       
+      dedicatedServer.openFirewall = true;      
+      localNetworkGameTransfers.openFirewall = true;
+    };
+  };
 
   programs.firefox = {
     enable = true;