v2 backend: custom domain

[rjhuijsman]

Summary

Currently, our v2 backend(s) are only reachable via a URL like https://OUR-PROJECT-ID.web.app.

Desired Solution

We'd like to set up a "custom domain" in Firebase Hosting so we can use human-friendly URLs.

Additional Context

The process of setting up a custom domain in Firebase Hosting is very easy. However, the person doing it needs to be able to change our DNS records.

In addition, it would be good to decide on and document the proper procedure by which we'll manage our custom domains. There seem to be roughly two options:

1. Manual process, with a user clicking around a webinterface a bit. Easy, but needs to be documented as a manual setup sep.
2. Automatic through Terraform. Currently unclear how this would work technically.

Please pick one and document the decision.

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