env vars: Client details should not be optional

[rht]

In current master, the check for whether the DB is seeded is if (process.env.EAUTH_CLIENT_NAME && process.env.EAUTH_CLIENT_ID && process.env.EAUTH_CLIENT_SECRET && process.env.EAUTH_REDIRECT_URI). Which doesn't seed if even one of the env vars is not specified. Those vars shouldn't be optional, and so users know that they have to specify them. This is especially the case when users are upgrading from the older version of the Docker container.

[hung-pelith]

We're attempting to build a new process for it.
It'll approximately be like:

1. Set up the address of admin in the .env file
2. A simple dashboard for the admin to edit the clients after login
3. Only the client name and redirect uri is editable, client id and client secret will be generated by the server

[rht]

If you use a web ui, then the set up process via Docker can no longer be automated.