refactor(nixos): simplify SteamCMD server options

configs/nixos/hosts/pikachu/default.nix

@@ -68,33 +68,28 @@
 
   modules.services.steamcmd = {
     enable = true;
-    dataDir = "/pikachu/data/steamcmd";
+    steamDir = "/pikachu/data/steamcmd";
     serviceName = "valheim";
     appId = 896660;
+    runtimeAppId = 892970;
     installDir = "/pikachu/data/servers/valheim/main";
-    workingDirectory = "/pikachu/data/servers/valheim/main";
-    group = "storage";
-    dataDirs = [ "/pikachu/media/games/servers/valheim/main" ];
-    packages = [ pkgs.steam-run ];
-    environment = {
-      SteamAppId = "892970";
-      SERVER_PASSWORD = "foobarbaz";
-    };
-    command = [
-      "${pkgs.bash}/bin/bash"
-      "-c"
-      ''
-        export LD_LIBRARY_PATH="$PWD/linux64:$LD_LIBRARY_PATH"
-        exec steam-run ./valheim_server.x86_64 \
-          -nographics \
-          -batchmode \
-          -name main \
-          -port 2456 \
-          -world main \
-          -savedir /pikachu/media/games/servers/valheim/main \
-          -password "$SERVER_PASSWORD" \
-          -public 0
-      ''
+    stateDir = "/pikachu/media/games/servers/valheim/main";
+    executable = "./valheim_server.x86_64";
+    arguments = [
+      "-nographics"
+      "-batchmode"
+      "-name"
+      "main"
+      "-port"
+      "2456"
+      "-world"
+      "main"
+      "-savedir"
+      "/pikachu/media/games/servers/valheim/main"
+      "-password"
+      "foobarbaz"
+      "-public"
+      "0"
     ];
     udpPorts = [
       2456