Fix doc (#10102)

## Why
Lots of sefl-hosted Help thread require to check if the worker is
running

This PR adds a new section to document **How to check the worker is
running?**

![image](https://github.com/user-attachments/assets/b2cbea68-0788-4ca0-9491-1dbc8264c688)

packages/twenty-website/src/content/developers/self-hosting/setup.mdx

@@ -235,7 +235,7 @@ yarn command:prod cron:calendar:ongoing-stale
   - EMAIL_SMTP_HOST=smtp.office365.com
   - EMAIL_SMTP_PORT=587
   - EMAIL_SMTP_USER=office365_email_address
-    - EMAIL_SMTP_PASSWORD='office365_password'
+  - EMAIL_SMTP_PASSWORD='office365_password'
 
   </ArticleTab>
 

packages/twenty-website/src/content/developers/self-hosting/troubleshooting.mdx

@@ -84,6 +84,24 @@ Warnings are informing about pulling additional dependencies which aren't explic
 
 That's expected as user is unauthorized when logged out since its identity is not verified.
 
+#### How to check if your worker is running?
+- Go to [webhook-test.com](https://webhook-test.com/) and copy **Your Unique Webhook URL**.
+<div style={{textAlign: 'center'}}>
+  <img src="/images/docs/developers/self-hosting/webhook-test.jpg" alt="Webhook test" />
+</div>
+- Open your Twenty app, navigate to `/settings`, and enable the **Advanced** toggle at the bottom left of the screen.
+- Create a new webhook.
+- Paste **Your Unique Webhook URL** in the **Endpoint Url** field in Twenty. Set the **Filters** to `Companies` and `Created`.
+<div style={{textAlign: 'center'}}>
+  <img src="/images/docs/developers/self-hosting/webhook-settings.jpg" alt="Webhook settings" />
+</div>
+- Go to `/objects/companies` and create a new company record.
+- Return to [webhook-test.com](https://webhook-test.com/) and check if a new **POST request** has been received.
+<div style={{textAlign: 'center'}}>
+  <img src="/images/docs/developers/self-hosting/webhook-test-result.jpg" alt="Webhook test result" />
+</div>
+- If a **POST request** is received, your worker is running successfully. Otherwise, you need to troubleshoot your worker.
+
 ### 1-click Docker compose
 
 #### Unable to Log In