fix(steam): Impermanence + Steam

hosts/sydpc/configuration.nix

@@ -13,7 +13,11 @@
   sydnix = {
     filesystemType = "btrfs";
 
-    steam.enable = true;
+    steam = {
+      enable = true;
+      impermanenceUsers = ["crumb"];
+    };
+
     niri.enable = true;
     stylix.enable = true;
     qemu.enable = true;