Add HealthCheck.io Notifications via Webhooks

[svenvg93]

📃 Description

To close #1556

Add support for Healthcheck.io notifications.

🪵 Changelog

➕ Added

• Add Healthcheck.io to the notification page
• Add /fail to the url for Threshold notifications
• Add helperText to the Threshold toggle to inform user it will be sent the /fail path
• Add heathcheck.io to the settings migration

📷 Screenshots

Settings page

Healthcheck.io Completed test:

Healthcheck.io Threshold breach

[alexjustesen]

Thanks for all the work on notification channels! Just a heads up I'm pointing the PRs at develop-0.21.0 so we can collect them all for the next release.

[svenvg93]

@alexjustesen do you how to make sure the threshold notification is sent after the completed one.

Now the completed comes after the threshold which makes healthcheck not sent the mail to the user.

[svenvg93]

Cant find a way to make sure the threshold will be sent as last, so lets go!