Add vulnerable Docker image

vuln_rfi/src/index.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * My home page
+ */
+
+$page = __DIR__."home.txt";
+
+if(isset($_GET["page"]))
+    $page = $_GET["page"];
+
+?>
+
+<pre>
+<?php echo file_get_contents($page); ?>
+</pre>
+
+Browse my website:
+<ul>
+    <li><a href="index.php?page=home.txt">home</a></li>
+    <li><a href="index.php?page=about.txt">about</a></li>
+    <li><a href="index.php?page=privacy.txt">privacy</a></li>
+</ul>