nixos/sysdig: init module

nixos/modules/module-list.nix

···
   ./programs/spacefm.nix
   ./programs/ssh.nix
   ./programs/ssmtp.nix
+  ./programs/sysdig.nix
   ./programs/thefuck.nix
   ./programs/tmux.nix
   ./programs/venus.nix

nixos/modules/programs/sysdig.nix

···
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.sysdig;
+in {
+  options.programs.sysdig.enable = mkEnableOption "sysdig";
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.sysdig ];
+    boot.extraModulePackages = [ config.boot.kernelPackages.sysdig ];
+  };
+}