Create new challenge Docker image

countries_list/docker/add_flag.php

@@ -0,0 +1,12 @@
+<?php
+
+// First, connect to database
+try {
+    $db = new PDO('sqlite:/var/www/html/database.db');
+} catch (PDOException $e) {
+    echo 'Connection to database failed: ' . $e->getMessage();
+}
+
+
+$stmt = $db->prepare("INSERT INTO secret (flag) VALUES (?)");
+$stmt->execute(array(getenv("FLAG")));