Moved some workers in their new habitat

src/Worker/CheckVersion.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @file include/checkversion.php
+ *
+ * @brief save Friendica upstream version to the DB
+ **/
+
+use Friendica\Core\Config;
+
+/**
+ * @brief check the git repository VERSION file and save the version to the DB
+ *
+ * Checking the upstream version is optional (opt-in) and can be done to either
+ * the master or the develop branch in the repository.
+ */
+function checkversion_run () {
+	global $a;
+
+	logger('checkversion: start');
+
+	$checkurl = Config::get('system', 'check_new_version_url', 'none');
+
+	switch ($checkurl) {
+	case 'master': 
+		$checked_url = 'https://raw.githubusercontent.com/friendica/friendica/master/VERSION'; 
+		break;
+	case 'develop': 
+		$checked_url = 'https://raw.githubusercontent.com/friendica/friendica/develop/VERSION'; 
+		break;
+	default: 
+		// don't check
+		return;
+}
+	logger("Checking VERSION from: ".$checked_url, LOGGER_DEBUG);
+
+	// fetch the VERSION file
+	$gitversion = dbesc(trim(fetch_url($checked_url)));
+	logger("Upstream VERSION is: ".$gitversion, LOGGER_DEBUG);
+
+	Config::set('system', 'git_friendica_version', $gitversion);
+
+	logger('checkversion: end');
+
+	return;
+}