Add NixOS module

module.nix

@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  strojnadzor = import ./. {};
+
+  cfg = config.services.strojnadzor;
+
+in
+
+{
+
+  options = {
+    services.strojnadzor = {
+      enable = mkOption {
+        default = false;
+        description = "
+          Whether to enable Strojnadzor
+        ";
+      };
+      hostname = mkOption {
+        default = "localhost";
+        description = "Listen to this hostname or ip.";
+      };
+      port = mkOption {
+        type = types.port;
+        default = 9000;
+        description = "Listen on this port.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.users.strojnadzor = {
+      description = "Strojnadzor user";
+      createHome = true;
+      isSystemUser = true;
+      group = "strojnadzor";
+      home = "/var/lib/strojnadzor";
+    };
+
+    users.groups.strojnadzor = {};
+
+    environment.systemPackages = [
+      strojnadzor
+    ];
+    systemd.services.strojnadzor =
+      {
+        description = "Strojnadzor HTTP server.";
+        after = [ "network.target" ];
+        wantedBy = [ "multi-user.target" ];
+        serviceConfig = {
+          User = "strojnadzor";
+          Group = "strojnadzor";
+          ExecStartPre = "${strojnadzor}/bin/strojnadzor-admin migrate";
+          ExecStart = "${strojnadzor}/bin/strojnadzor-admin runserver-uvicorn ${cfg.hostname} ${toString cfg.port}";
+        };
+        environment.STROJNADZOR_DATA_DIR = "/var/lib/strojnadzor/data";
+      };
+  };
+}