add internal route to retire

src/routes/internal.js

@@ -4,7 +4,8 @@
 
 exports = module.exports = {
     backup: backup,
-    update: update
+    update: update,
+    retire: retire
 };
 
 var cloudron = require('../cloudron.js'),
@@ -39,3 +40,15 @@ function update(req, res, next) {
     });
 }
 
+function retire(req, res, next) {
+    debug('triggering retire');
+
+    // note that cloudron.backup only waits for backup initiation and not for backup to complete
+    // backup progress can be checked up ny polling the progress api call
+    cloudron.retire(function (error) {
+        if (error && error.reason === CloudronError.BAD_STATE) return next(new HttpError(409, error.message));
+        if (error) return next(new HttpError(500, error));
+
+        next(new HttpSuccess(202, {}));
+    });
+}