Add GITLAB_SHELL_CUSTOM_HOOKS_DIR

Author: taomaree

README.md

@@ -887,6 +887,7 @@ Below is the complete list of available options that can be used to customize yo
 | `GITLAB_PROJECTS_SNIPPETS` | Set if *snippets* feature should be enabled by default for new projects. Defaults to `false`. |
 | `GITLAB_PROJECTS_BUILDS` | Set if *builds* feature should be enabled by default for new projects. Defaults to `true`. |
 | `GITLAB_PROJECTS_CONTAINER_REGISTRY` | Set if *container_registry* feature should be enabled by default for new projects. Defaults to `true`. |
+| `GITLAB_SHELL_CUSTOM_HOOKS_DIR` | Global custom hooks directory. Defaults to `/home/git/gitlab-shell/hooks`. |
 | `GITLAB_WEBHOOK_TIMEOUT` | Sets the timeout for webhooks. Defaults to `10` seconds. |
 | `GITLAB_NOTIFY_ON_BROKEN_BUILDS` | Enable or disable broken build notification emails. Defaults to `true` |
 | `GITLAB_NOTIFY_PUSHER` | Add pusher to recipients list of broken build notification emails. Defaults to `false` |