SeoPanel Docker Version. You should extend the Docker Image with your config after first install.
Just execute
docker-compose up -d
Afterwords goto http://lvh.me:8080 and follow the install wizard with these settings:
Database type: Mysql
Database server hostname: mariadb
Database name: seopanel
Database username: root
Database password: testpw
For the next startup you can modify the docker-compose.yml and change SP_INSTALLED from false to true.
Unfortunately i did not find an easy way to execute the setup. So the database migration is missing.