feat: print server code error stack in verbose mode

Author: vengrov

lib/server-code/runners/tasks/executor.js

@@ -94,7 +94,7 @@ function enrichTask(task, opts) {
  * @returns {String} task invocation result in JSON
  */
 function wrapResult(task, result, error) {
-  error && logger.error(`Error: ${error.message || error}`);
+  error && logger.error(`Error: ${logger.verbose && error.stack || error.message || error}`);
 
   return JSON.stringify(
     rsiTask(task)