Webhook notifications for container registry events
## Problem to solve The new container registry is very useful for deployments. Because of this, it would be a great idea to have granular [GitLab webhook notifications](https://docs.gitlab.com/ee/user/project/integrations/webhooks.html) in reaction to specific container registry events (tag push, tag delete, etc.). ## Proposal Add support for configuring this notification in the same area as webhooks. This is not to propose design details, just a top-level feature request since I could not find any pre-existing for this. <!-- triage-serverless v3 PLEASE DO NOT REMOVE THIS SECTION --> *This page may contain information related to upcoming products, features and functionality. It is important to note that the information presented is for informational purposes only, so please do not rely on the information for purchasing or planning purposes. Just like with all projects, the items mentioned on the page are subject to change or delay, and the development, release, and timing of any products, features, or functionality remain at the sole discretion of GitLab Inc.* <!-- triage-serverless v3 PLEASE DO NOT REMOVE THIS SECTION -->
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