Create way to programmatically log in locally

[ryanolee]

Currently the only way to login locally is to use shared secrets from a google oauth account. This is not ideal as it forces us to share secrets. It would be good to have a way to factory JWT's locally for users created by any given fixture in order to help with the local dev flow 🤔

[tsukimi2]

@ryanolee I might be interested in helping out with this issue, but I'm not quite certain whether I get what this issue is saying. Do you mean that, in addition to the google oauth authentication flow that we currently have, we would like to create an additional authentication flow based on local jwt authentication (i.e. depending on only username and password stored in fixture and associated jwt token) for the explicit purpose of testing?