Ephemeral datacenters in the `up` command

[davidthor]

Is your feature request related to a problem? Please describe.

There are some cases where I want to play around with a component in a temporary datacenter, but it is clunky to spin up the datacenter and tear it down before and after I run the up command.

Describe the solution you'd like

I'd like to be able to pass in my datacenter by file using -d, --datacenter and have the datacenter created and cleaned up before and afterwards:

$ arcctl up . -d ./path/to/datacenter.yml
$ arcctl up . -d https://raw.githubusercontent.com/architect-team/arcctl/main/examples/datacenters/local.yml