why my st2 workflows always assign null value on action output even my action can give the output?

[idham1311]

SUMMARY

Hello, I already create the sample workflow to make sure that I can get the output from action output. But when the workflow run successfully. It doesnt show any output. Anyone know how to set the value of the output?

STACKSTORM VERSION

st2 3.7.0, on Python 3.8.10

OS, environment, install method

linux

Steps to reproduce the problem

Show how to reproduce the problem, using a minimal test-case. Make sure to include any content
(pack content - workflows, actions, etc.) which are needed to reproduce the problem.
this is my workflow:

this is result for mysqldump:

Expected Results

expect action output can shows the output from the action on the workflows.
What did you expect to happen when running the steps above?

Actual Results

What happened? What output did you get?
null values

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!