setup mail dev

1.Run mail dev

2.Add following environment variables to .env

UNDB_MAIL_PROVIDER=basic
UNDB_MAIL_HEALTH=http://localhost:1080/healthz
UNDB_MAIL_HOST=0.0.0.0
UNDB_MAIL_PORT=1025
UNDB_MAIL_DEFAULT_FROM='"undb" <no-reply@undb.xyz>'