Ability to attach screenshot to Slack alert

[anh-zenfolio]

We have been using Checkly for 2 years now to monitor our infrastructure. One thing that we really want that we want to be able to send screenshots of failed tests to Slack. Currently, it just notifies via Slack that a test fails. We won't know details until we log into the Checkly. If Checkly can attach a screenshot of the failed test to Slack would be great. So, we know immediately what happened. Especially when you use mobile devices.