Set harder security constraints

phpcs-errors:0 phpunit-status:successful phpstan-errors:665

public/security.php

@@ -0,0 +1,21 @@
+<?PHP
+/**
+ * Generates a CSV template based on the field list provided for CSVXML.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+require_once __DIR__ . "/../functions/functions.php";
+
+header("Content-type: text/plain");
+echo MD_JAIL::check_server_setup([
+    "shell_access_whitelist"    => [],
+    "sys_function_whitelist"    => ["getenv"],
+    "file_function_whitelist"   => [],
+    "file_uploads"              => true,
+    "allow_url_fopen"           => false,
+    "max_input_vars"            => 100, // Default: 1000
+    "max_input_nesting_level"   => 10, // Default: 1000
+    "post_max_size"             => "4M",
+    "curl"                      => false,
+]);