Webhooks full url of image

Description

The problem with using Webhooks is the relative URL for images posted on issues do not translate to other services. For our case absolute URLs would be ideal as messaging apps would display them properly.

Here is an image in GitLab working correctly:

The webhook to MatterMost in our case is not working:

Proposal

The proposal is to also send down full URLs of images in comments on the outgoing webhook.

Benefits:

• No extra legwork for consumers
• Easy adoption by consumers to utilize the functionality
• Minimal complexity

~webhooks ~"feature proposal"