Allow to disable `pages:root` in `config/gitlab.yml`
Since Pages can run in a fully remote type of access we should allow disabling a disk type of access for Pages as defined in Rails. The FF is a good temporary thing to disable a NFS type of access, but we should rather have a proper behaviour implemented as a first-class configuration. Maybe we change it to support: ``` pages: enabled: false access_control: false # The location where pages are stored (default: shared/pages). path: false ``` This would be the kill switch that would be used to ensure that we never touch a disk storage, if defined. This also is how GitLab would be configured on GitLab.com: it would have `path: false` and `object_store:` configured only.
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