Release Post 12.6: API packages of a group

data/release_posts/unreleased/api_packages_group.yml

+features:
+  secondary:
+    - name: "API endpoint to list the packages of a group"
+      available_in: [premium, ultimate]
+      documentation_link: 'https://docs.gitlab.com/ee/api/packages.html#within-a-group'
+      reporter: trizzi
+      stage: package
+      issue_url: 'https://gitlab.com/gitlab-org/gitlab/issues/10003'
+      description: |
+        As part of the GitLab Package Registry, we provide an [API](https://docs.gitlab.com/ee/api/packages.html), to allow users to view,
+        download, and delete packages. However, until recently the API was limited to a specific project, which prevented users from 
+        understanding which packages exist at the group level. 
+        
+        In GitLab 12.6, we are excited to announce a new API endpoint that will allow users to list all packages at the group level. 
+