Symlink `.ruby-version` in GDK in GitLab repository
Since we are executing Ruby in both GDK that holds foreman and GitLab that contains GitLab application, we should take care about same version of Ruby language.
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Do not update/delete: Notification broadcast message test data
Since we are executing Ruby in both GDK that holds foreman and GitLab that contains GitLab application, we should take care about same version of Ruby language.