Add telegram notifications

modules/telegram-notifications/default.nix

@@ -0,0 +1,15 @@
+{ custom, inputs, pkgs, ... }:
+let
+  telegram-notify-env = "/home/${custom.username}/.nixos/secrets/passwords/telegram_notify_env";
+  telegram = pkgs.writeShellScriptBin "telegram" ''
+    export $(${pkgs.gnugrep}/bin/grep -v '^#' ${telegram-notify-env} | ${pkgs.findutils}/bin/xargs)
+    URL="https://api.telegram.org/bot$TELEGRAM_KEY/sendMessage"
+    curl -s -d "chat_id=$CHAT_ID&disable_web_page_preview=1&text=$1" $URL > /dev/null
+  '';
+in
+{
+  environment.systemPackages = with pkgs;
+    [
+      telegram
+    ];
+}