Add proton-launch

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/gui/gaming/proton/default.nix

@@ -0,0 +1,17 @@
+{ user, home }:
+{ lib, pkgs, ... }:
+{
+  environment.persistence."/persist/state"."${home}/.local/share/proton" = { };
+
+  home-manager.users.${user}.home.packages = [
+    (pkgs.writeShellApplication {
+      name = "proton-launch";
+      runtimeInputs = with pkgs; [ coreutils ];
+      runtimeEnv = {
+        PROTON = lib.makeSearchPathOutput "steamcompattool" "" [ pkgs.proton-ge-bin ];
+        STEAM_RUN = lib.meta.getExe pkgs.steam-run;
+      };
+      text = builtins.readFile ./proton-launch.sh;
+    })
+  ];
+}