Expose settings in `gitlab.rb` to specify commands to generate extra configuration for services that support it
Certain services provide options to the users to specify a command to be run to generate configuration (that will be merged with existing configuration), which is useful to specify sensitive configuration. Expose these capabilities via `gitlab.rb` settings.
* KAS
* GitLab Exporter
* Workhorse
* Rails - Redis
* Rails - DB
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