[FEAT] webhook on receiving approval response from dashboard

[edwinkys]

Feature Description

We want to add the capability for users to configure webhook which will be trigger after receiving an approval response from the dashboard. This allows users to customize the flow after approver respond to the approval request such as piping the data into a log or data warehouse.

Potential Solution

• User should be able to configure the webhook URL and authentication via environment variables.
• When the server start we will check to see if webhook is configured.
• If configured, after receiving a response from the dashboard, we will trigger the webhook.