If the folder `/car/cache/dnf` is present, the content will be cached
like in the Yum plugin.
A possible configuration to enable it:
Vagrant.configure(2) do |config|
config.vm.box = "fedora/24-cloud-base"
if Vagrant.has_plugin?("vagrant-cachier")
config.cache.scope = :machine
config.cache.auto_detect = false
config.cache.enable :dnf
end
end
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