add nixos module

nix/module.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.services.evtype;
+in {
+  options.services.evtype = {
+    enable = mkEnableOption "Enables the evtype service";
+
+    package = mkOption {
+      type = types.package;
+      description = "package to use";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [cfg.package];
+
+    systemd.services.evtype = {
+      wantedBy = ["multi-user.target"];
+      description = "EvType daemon";
+
+      serviceConfig = {
+        Restart = "on-failure";
+        ExecStart = "${cfg.package}/bin/evtype_daemon";
+        DynamicUser = true;
+        PrivateTmp = true;
+        ProtectSystem = "strict";
+        ProtectHome = true;
+        NoNewPrivileges = true;
+        ProtectClock = true;
+        CapabilityBoundingSet = true;
+        ProtectKernelLogs = true;
+        ProtectControlGroups = true;
+        SystemCallArchitectures = "native";
+        ProtectKernelModules = true;
+        RestrictNamespaces = true;
+        MemoryDenyWriteExecute = true;
+        ProtectHostname = true;
+        LockPersonality = true;
+        ProtectKernelTunables = true;
+        RestrictAddressFamilies = ["AF_UNIX"];
+        RestrictRealtime = true;
+        SystemCallFilter = ["@system-service" "~@resources" "~@privileged"];
+        IPAddressDeny = "any";
+        RuntimeDirectory = "evtype";
+      };
+    };
+  };
+}

nix/package.nix

@@ -4,10 +4,11 @@
   lib,
 }: let
   inherit (lib.sources) sourceByRegex;
+  inherit (builtins) fromTOML readFile;
 in
   rustPlatform.buildRustPackage rec {
     pname = "evtype";
-    version = "0.1.0";
+    version = (fromTOML (readFile ../Cargo.toml)).package.version;
 
     src = sourceByRegex ../. ["Cargo.*" "(src)(/.*)?"];