added some nurPkgs

mods/imap-backup/package.nix

@@ -0,0 +1,40 @@
+{ pkgs
+, bundlerEnv
+, ruby
+, stdenv
+, lib
+, fetchFromGitHub
+}:
+let
+  ruby-nix-flake = builtins.getFlake "github:inscapist/ruby-nix/81709ec61d212dce4d45615b5865f7381e4d1c2e";
+  rubyNix = ruby-nix-flake.outputs.lib pkgs;
+  myEnv = rubyNix {
+    name = "imap-backup-env";
+    gemset = ./gemset.nix;
+  };
+
+  src = fetchFromGitHub {
+    owner = "joeyates";
+    repo = "imap-backup";
+    rev = "v${version}";
+    sha256 = "sha256-FJujesExQ4H+RoRUXec5Akp1z1f5nbmMj7cQSk4nkgQ=";
+  };
+  
+  version = "15.0.2";
+in pkgs.writeShellApplication rec {
+  name = "imap-backup";
+
+  text = ''
+    ${myEnv.ruby}/bin/ruby ${src}/bin/imap-backup "$@"
+  '';
+
+  meta = with lib; {
+    description = "Backup and Migrate IMAP Email Accounts ";
+    longDescription = ''
+      from: https://github.com/joeyates/imap-backup
+    '';
+    homepage = "https://github.com/joeyates/imap-backup";
+    #maintainers = [ ];
+    platforms = platforms.all;
+  };
+}