Create integration test that starts a mastodon instance using auraed

[bpmooch]

As an exploration in creating real use cases for aurae, create an integration test that starts and configures a mastodon instance.

https://docs.joinmastodon.org/user/run-your-own/ here's some docs but I'm not sure they are useful lol

[dmah42]

having this as a cell, as a VM, as a CRI would be amazing. i don't know if mastodon is simple enough for an integration test, but as a proof of concept it might help highlight any gaps.