8839 workflow follow up code step (#8856)

- add readonly mode
- fix falsy stepOutput computation

packages/twenty-server/src/engine/core-modules/serverless/drivers/lambda.driver.ts

@@ -319,6 +319,7 @@ export class LambdaDriver implements ServerlessDriver {
     await this.waitFunctionUpdates(functionToExecute.id, 10);
 
     const startTime = Date.now();
+
     const params: InvokeCommandInput = {
       FunctionName: functionName,
       Payload: JSON.stringify(payload),