Add staging server that deploys every commit

[ml-evs]

Given all of the automations now present at https://github.com/datalab-industries/datalab-ansible-terraform, I think it would beneficial for us to consider having a test server that deploys, at the very least, on every push to main.

This could run out of a separate repository and also run the cypress tests on the remote system, either nuking the database in between deployments, or starting with some stock data.

I don't think we necessarily need to do the same thing for PR builds, but this approach would be nice for catching more subtle deployment issues.