Because polyculeconnect is a OIDC proxy, we need to know which auth
backend to use. This is provided using a query param or a form, so we
need to get it from our own middleware.
This commit adds the following elements:
- basic DB storage for the backends
- support for DB migrations and a first test migration (not definitive)
- middleware to get the backend from the request and put it in the
context
- test that the backend exists in the auth flow
Start the process of replacing dex with zitadel, this commit is
absolutely not prod-ready, basically we just added zitatel, and the
necessary elements to make it work to at least getting a client from the
DB
- replace logrus with zap
- start our own storage for the users
- instanciate zitaled on start
- allow getting client using the ID from the DB
