Invite-only - Allow signup from invited but no one else

[konrad.sopala]

Hey there Folks!

I’ve got a final update for you with the solution:

1. Create a database connection.
2. Enable it for each organization as needed.
3. Use Organization Membership Invitation, assigning role & user metadata as needed
4. Don’t use that database connection for other applications if you don’t want anyone to be able to signup