Add snippet on how to export a project to GitLab Rails Console Cheat Sheet

doc/administration/troubleshooting/gitlab_rails_cheat_sheet.md

@@ -374,6 +374,26 @@ Clear the cache:
 sudo gitlab-rake cache:clear
 ```
 
+### Export a repository
+
+It's typically recommended to export a project through [the web interface](../../user/project/settings/import_export.md#exporting-a-project-and-its-data) or through [the API](../../api/project_import_export.md). In situations where this is not working as expected, it may be preferable to export a project directly via the Rails console:
+
+```ruby
+user = User.find_by_username('USERNAME')
+project = Project.find_by_full_path('PROJECT_PATH')
+Projects::ImportExport::ExportService.new(project, user).execute
+```
+
+If the project you wish to export is available at `https://gitlab.example.com/baltig/pipeline-templates`, the value to use for `PROJECT_PATH` would be `baltig/pipeline-templates`. 
+
+If this all runs successfully, you will see output like the following before being returned to the Rails console prompt:
+
+```ruby
+=> nil
+```
+
+The exported project will be located within a `.tar.gz` file in `/var/opt/gitlab/gitlab-rails/uploads/-/system/import_export_upload/export_file/`. 
+
 ## Repository
 
 ### Search sequence of pushes to a repository