migrate arma configs to module

modules/nixos/common/arma.nix

@@ -0,0 +1,64 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.services.arma;
+in
+{
+  options.services.arma = {
+    enable = lib.mkEnableOption "enable arma";
+    dataDir = lib.mkOption {
+      type = lib.types.str;
+      default = "/var/lib/steam";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    nixpkgs.config.allowUnfreePredicate =
+      pkg:
+      builtins.elem (lib.getName pkg) [
+        "steamcmd"
+        "steam-run"
+        "steam-unwrapped"
+      ];
+    # Create steam user
+    users = {
+      users.steam = {
+        isSystemUser = true;
+        home = cfg.dataDir;
+        createHome = true;
+        shell = pkgs.bash;
+        group = "steam";
+      };
+      groups.steam = { };
+    };
+    systemd.tmpfiles.rules = [
+      # "d /var/lib/steam 0755 steam steam -"
+      "d ${cfg.dataDir}/reforger/configs 0755 steam steam -"
+      "d ${cfg.dataDir}/reforger/profile 0755 steam steam -"
+      "d ${cfg.dataDir}/reforger/workshop 0755 steam steam -"
+    ];
+    systemd.services = {
+      arma = {
+        description = "arma game server";
+        wantedBy = [ "multi-user.target" ];
+        environment = {
+          ARMA_DIR = "${cfg.dataDir}";
+        };
+        path = with pkgs; [
+          curl
+          steamcmd
+          steam-run
+        ];
+        preStart = "${pkgs.arma-scripts}/scripts/update.sh";
+        serviceConfig = {
+          User = "steam";
+          WorkingDirectory = "${cfg.dataDir}/reforger";
+          ExecStart = "${pkgs.arma-scripts}/scripts/start.sh";
+        };
+      };
+    };
+  };
+}