Initial structure of Queue system, with Redis driver

common/scripts/cron.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * This script runs the task queue.
+ *
+ * Unlike other scripts provided with Rhymix, it can be called
+ * both on the command line and over the network.
+ */
+
+if (PHP_SAPI === 'cli')
+{
+	require_once __DIR__ . '/common.php';
+}
+else
+{
+	// If called over the network, bypass CLI checks.
+	chdir(dirname(dirname(__DIR__)));
+	require_once dirname(__DIR__) . '/autoload.php';
+	Context::init();
+
+	// On the other hand, we should check the key.
+	$key = (string)Context::get('key');
+	if (!Rhymix\Framework\Queue::checkKey($key))
+	{
+		header('HTTP/1.1 403 Forbidden');
+		echo "Invalid key\n";
+		Context::close();
+		exit;
+	}
+}
+
+// The rest of the work will be done by the Queue class.
+$timeout = config('queue.interval') ?? 60;
+Rhymix\Framework\Queue::process($timeout);