Rocket.Chat incoming webhooks on card events

[TomaszDom]

✨ Feature Request

Is your feature request related to a problem? Please describe.
Rocket.chat channel with notifications from kan's card events. E-mail notifications are sometimes not enough.

Describe the solution you'd like
Enable/disable rocket.chat webhooks, provide rocket.chat URL, provide rocket.chat TOKEN. Customize which events should trigger a webhook.

A payload looks like this:

{
  "text": "Example message",
  "attachments": [
    {
      "title": "Rocket.Chat",
      "title_link": "https://rocket.chat",
      "text": "Rocket.Chat, the best open source chat",
      "image_url": "[ROCKETCHAT_URL]/images/integration-attachment-example.png",
      "color": "#764FA5"
    }
  ]
}

sending an example message looks like this:

curl -X POST -H 'Content-Type: application/json' --data '{"text":"Example message","attachments":[{"title":"Rocket.Chat","title_link":"https://rocket.chat","text":"Rocket.Chat, the best open source chat","image_url":"[ROCKETCHAT_URL]/images/integration-attachment-example.png","color":"#764FA5"}]}' [ROCKETCHAT_URL]/hooks/[ROCKETCHAT_TOKEN]

There should be three new variables, for enabling this feature, for providing the URL and for providing the token.

The webui should allow enabling/disabling webhooks per board and choosing which card events should fire a webhook.

Describe alternatives you've considered
E-mail notifications, but they aren't enough for us.

Additional context

Implementation ideas (optional)

Would you like to work on this feature?

• Yes, I'd like to help implement this feature
• [ x] No, I'm just suggesting the feature