Mention limitation of custom filesystem hooks since GItLab 7.13

Since 7.13 we dont use satellites for web editor and accepting merge requests. GitLab does not do push to bare repo but instead write directly into git. This will cause custom filesystem hooks in gitlab-shell to ignore GitLab direct writes.

This should be added to 7.13 blog post

mentioned in issue #1974 (closed)

This should be added to 7.13 blog post

This should be a new blog post explaining why you did and how to migrate existing custom-hooks.

we return satellites to 7.13 and 7.14 so no mention needed - https://gitlab.com/gitlab-org/gitlab-ce/issues/1974#note_1865699

Status changed to closed