Add cronjob to send alive signal

src/cron.js

@@ -23,6 +23,7 @@ var gAutoupdaterJob = null,
     gBoxUpdateCheckerJob = null,
     gAppUpdateCheckerJob = null,
     gHeartbeatJob = null,
+    gAliveJob = null,
     gBackupJob = null,
     gCleanupTokensJob = null,
     gCleanupBackupsJob = null,
@@ -53,6 +54,12 @@ function initialize(callback) {
     });
     cloudron.sendHeartbeat(); // latest unpublished version of CronJob has runOnInit
 
+    gAliveJob = new CronJob({
+        cronTime: '00 */1 * * * *', // every minute
+        onTick: cloudron.sendAliveStatus,
+        start: true
+    });
+
     if (cloudron.isConfiguredSync()) {
         recreateJobs(callback);
     } else {
@@ -207,6 +214,9 @@ function uninitialize(callback) {
     if (gHeartbeatJob) gHeartbeatJob.stop();
     gHeartbeatJob = null;
 
+    if (gAliveJob) gAliveJob.stop();
+    gAliveJob = null;
+
     if (gBackupJob) gBackupJob.stop();
     gBackupJob = null;