Group hooks (custom hooks per group basis)
### Description
As I understand the documentation, there is no simple way to define custom serverside hooks on group level.
At the moment there are global hooks and per project hooks.
### Proposal
Something between project custom hooks and globally defined hooks.
### Links / references
https://docs.gitlab.com/ce/administration/custom_hooks.html
#### Overview
In a group of projects similar behaviour is neccessary. Defining it globally is here not applicable.
#### Use cases
We want to create a group of projects with identical hooks. Adding a new project to this groups creates workload/overhead by adding the same custom hooks at the server.
...but maybe it's allready available or possible today?
issue