def add_as_highest(var, value)
      # Don't want to override anything, so just shift in a dummy site config instance at the highest level and
      # set the value there.
      c = Config.new(path: :runtime, parent: self, values: { var.to_s => value })
      configs.prepend(Config.new(path: :runtime, parent: self, values: { var.to_s => value }))
    end
def add_as_highest(var, value)
      # Don't want to override anything, so just shift in a dummy site config instance at the highest level and
      # set the value there.
      c = Config.new(path: :runtime, parent: self, values: { var.to_s => value })
      configs.prepend(Config.new(path: :runtime, parent: self, values: { var.to_s => value }))
    end
Dynamically add a new site variable at the highest priority.